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Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
Report of the Head of Development Management and Building Control
Committee Report
Case Officer: Michael Briginshaw 78343/APP/2025/719
Date Application
Valid:
28.03.2025 Statutory / Agreed
Determination
Deadline:
09.10.2025
Application
Type:
Full Ward: Wood End
Applicant: Colt Data Centre Services
Site Address: Hayes Bridge Retail Park and Heathrow
Interchange, Uxbridge Road
Proposal
(Summarised):
This hybrid planning application seeks permission
for a four-phased redevelopment to deliver a data
centre campus comprising:
Full planning permission for a data centre building
and associated infrastructure/works (Phase 1);
Outline planning permission for an Innovation Hub
and infrastructure/works (Phase 2);
Outline planning permission for a data centre
building and associated infrastructure/works
(Phase 3); and
Outline planning permission for a data centre
building and associated infrastructure/works
(Phase 4). All matters are reserved for the Outline
phases of development.
Summary of
Recommendation:
GRANT planning permission subject to section
106 legal agreement and conditions
Reason Reported
to Committee:
Required under Part 1 of the Planning Scheme of
Delegation (Major application recommended for
approval)
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
Summary of Recommendation:
GRANT planning permission subject to the completion of a
satisfactory section 106 legal agreement to secure the heads of
terms set out below, and subject to the conditions as set out in
Appendix 1.
Mayor of London Stage 2 Referral & S106 Legal Agreement Heads of Terms
It is recommended that delegated powers be given to the Director of Planning
and Sustainable Growth to grant planning permission subject to the following:
A) That the application be referred to the Mayor under Article 5 of the Town
and Country Planning (Mayor of London) Order 2008.
B) That the Council enter into a legal agreement with the applicant under
Section 106 of the Town and Country Planning Act 1990 (as amended) or
any other legislation to secure the following:
i. Innovation Hub: To secure the Innovation Hub as genuinely
affordable workspace (including peppercorn rents) with publicly
accessible ancillary floorspace for sale of food and drink.
ii. Public Art: To secure high quality public art as part of the Innovation
Hub development, to be delivered in conjunction with Phase 2.
iii. Air Quality Contribution: Financial contributions shall be paid to the
Council to address air quality impacts arising from the development.
£1,026,166
shall be paid for Phase 1 (LON6). The obligation shall
secure the payment of contributions for Phases 2, 3 and 4 but these
shall be calculated at the relevant reserved matters application stage.
The contributions could rise to more depending on emission
monitoring results in year 2 of operation of each phase of
development and subsequent years, in accordance with the air
quality conditions.
iv. Architect Retention: Retention of the developer’s architectural design
team to the completion of the project.
v. Carbon Offset Contribution: A financial contribution of £1,830,527 for
Phase 1 (LON6). The obligation shall secure the payment of
contributions for Phases 2, 3 and 4 but these shall be calculated at
the relevant reserved matters application stage.
vi. Travel Plan: A full Travel Plan to be approved in writing by the Local
Planning Authority (for each phase).
vii. Healthy Streets/Active Travel Zone Contribution: A financial
contribution of £209,660 payable to cover all four phases.
viii. Section 278 Agreement: A Section 278 agreement to implement the
site highways works on Uxbridge Road consisting of the remodelling
of the junction bellmouth to include a straight across toucan crossing
for c
yclists and pedestrians at the site entrance.
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PART 1 – Members, Public & Press
ix. Employment/Construction Training Scheme: An Employment/
Construction Training Scheme secured in accordance with the
Council's Planning Obligations SPD, including securement of end
user jobs.
x. Project Management & Monitoring Fee: A Project Management and
Monitoring Fee, equalling 5% of the total financial contributions to be
paid under this agreement.
C) That in respect of the application for planning permission, the applicant
meets the Council's reasonable costs in preparation of the Section 106
Agreement and any abortive work as a result of the agreement not being
completed.
D) That officers be authorised to negotiate and agree the detailed terms of
the proposed agreement and conditions of approval and agree any changes
requested by the Greater London Authority.
E) That, if the Legal Agreement has not been finalised within 6 months (or
such other time frame as may be agreed by the Director of Planning and
Sustainable Growth), delegated authority be given to the Director of
Planning and Sustainable Growth to refuse planning permission for the
following reason:
'The applicant has failed to mitigate the impacts posed by the proposed
development (in respect of Affordable Workspace, Design (Public Art), Air
Quality, Carbon Offsetting, Travel Planning, Highways Safety, Employment
and Planning Obligations Monitoring). The scheme therefore conflicts with
Policies DMCI 7 of the Hillingdon Local Plan: Part 2 (2020); the adopted
Planning Obligations Supplementary Planning Document (2014); Policy
DF1 of the London Plan (2021); and paragraphs 56-58 of the National
Planning Policy Framework (2024).'
E) That if the application is approved, that the permission is subject to the
Conditions as set out in Appendix 1.
1 Executive Summar
y
1.1 This hybrid planning application seeks permission for a four-phased
redevelopment to deliver a data centre campus comprising Phase 1 for Full
planning permission for data centre building LON6 and associated
infrastructure/works; Phase 2 for Outline planning permission for an Innovation
Hub and infrastructure/works; Phase 3 for Outline planning permission for data
centre building LON7 and associated infrastructure/works; and Phase 4 for
Outline planning permission for data centre building LON8 and associated
infrastructure/works. All matters are reserved for the Outline phases of
development.
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PART 1 – Members, Public & Press
1.2 The development would demolish the existing and largely vacant low density
out-of-town centre Hayes Bridge Retail Park and Heathrow Interchange Class
B8 warehouses and replace them with a hyperscale data centre campus, to
connect to an established data centre development on land at Tudor Works
located to the south on Beaconsfield Road. The loss of the retail park and Class
B8 warehouses is accepted and the Class B8 data centre development is an
appropriate use within the Hayes Strategic Industrial Location. Data centres are
now classed as Critical National Infrastructure and the significant uplift in
floorspace would ensure the intensification of industrial capacity, which is
supported by strategic policies. The proposed office floorspace would be
ancillary to the primary data centre use and is therefore considered acceptable
in principle.
1.3 The economic benefit of information and communications technology
infrastructure is acknowledged and supported by national, regional and local
planning policies. As noted under Paragraph 85 of the National Planning Policy
Framework (2024), significant weight should be placed on the need to support
economic growth and productivity. There would be substantial economic benefits
arising from the proposed development in terms of employment. The national
non-domestic rates (NNDR) and gross value added (GVA) increases are also
significant. There is need for additional data capacity to be located within London
to be as close as possible to its end users and support the broader economy.
These benefits and considerations are given significant weight in the overall
assessment of the plannin
g balance.
1.4 Given the substantial power demand associated with data centres, the applicant
has outlined the strategy in the Infrastructure Statement. The development
requires 250MW of power, secured through two independent National Grid
connections: Substation 1 (100MW) from Uxbridge Moor/Iver B and Bullsbrook
Road Substation (Substation 2) (150MW) from North Hyde, with phased delivery
between 2027 and 2029. Therefore, the development has secured a power
supply, would not overburden the local grid capacity (by virtue of securing the
power) and is not considered to result in detrimental impacts connected to
ener
gy infrastructure.
1.5 In terms of design, the proposed development is considered to significantly alter
the skyline resulting in a “tall building” located outside of the suitable areas
identified in the development plan. This creates a partial policy conflict with the
location elements of policies D9 and DMHB10. However, the high quality of the
design and elevational treatments are considered to soften its townscape impact
and mitigate any potential harm. Furthermore, whilst the proposed development
is larger in height and mass than much of the immediate surroundings, recent
developments in the wider locality, including the connected data centre campus
on land at Tudor Works (granted permission under ref. 38421/APP/2021/4045)
and the Green Quarter in Southall, are creating a new townscape context of taller
buildings. The proposed development also retains an industrial/technological
aesthetic that respects the immediate area's emerging character. The
elevational treatment aids the softening of the development and makes it more
visuall
y attractive.
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1.6 In order to offset the possible overbearing nature of the wider data centre
development, the Innovation Hub (Phase 2) is proposed as the community piece
to front the campus. Whilst this element of development is proposed in Outline,
the Design Code and planning conditions would secure a high-quality form of
development. Furthermore, a high-quality public art piece is proposed to
complement the Innovation Hub use and would be secured by Section 106 legal
agreement should the application be recommended for approval. In combination,
the design would positively contribute to the industrial estate and townscape
character. Subject to necessary planning conditions and obligations, the
development would add real design and public benefit to the site, which would
wei
gh in favour of the scheme in the planning balance.
1.7 Planning obligations are proposed to secure the Innovation Hub as genuinely
affordable workspace in perpetuity, the provision of public art in conjunction with
the Innovation Hub (Phase 2), the retention of the architects to ensure delivery
of high quality design, travel plan, section 278 highways works for Uxbridge
Road junction improvements (including a toucan crossing), employment and
construction training schemes, and contributions towards air quality mitigation,
carbon offsettin
g and healthy streets / active travel zone improvements.
1.8 Subject to the planning conditions and obligations recommended, the proposed
development is considered acceptable with respect to design, heritage,
residential amenit
y, environmental issues, transport, and sustainability.
1.9 Due regard has been given to the comments received as part of the consultation
process and it is concluded that the proposal complies with the Development
Plan. Section 38(6) of the Planning and Compulsory Purchase Act 2004 states
that planning applications should be determined in accordance with the
development plan unless material considerations indicate otherwise. For the
reasons outlined above and within the main body of the report, this application
is considered to comply with the Development Plan and is recommended for
approval, subject to securing the planning conditions set out in Appendix 1, a
Section 106 legal agreement and Stage 2 referral to the Greater London
Authorit
y.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
2 The Site and Localit y
Figure 1: Location Plan (application site edged red)
2.1 The site comprises two land parcels, including the Hayes Bridge Retail Park site
and Heathrow Interchange site. The sites are located on the eastern boundary
of Hillingdon Borough in Hayes, bordering Southall in Ealing Borough. Uxbridge
Road is the main thoroughfare into and out of the Borough and any proposal will
impact on the initial perception of Hillingdon as a place. Please refer to Figure 1
for the site location plan.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
Figure 2: View of the Hayes Bridge Retail Park Site from Uxbridge Road
2.2 The Hayes Bridge Retail Park site measures circa 3 hectares in area and
comprises a large L-shaped building made up of seven retail units (most of which
are vacant), a large car park to the front (northside) accessed from Uxbridge
Road and service yard to the rear (southside) accessed from Bullsbrook Road.
The Metro Bank site belongs to the same owner and sits in the north-eastern
corner. The site is bound to the north by Uxbridge Road, to the east by the
Yeading Brook river, to the south by Bullsbrook Road, and to the west by an
undeveloped parcel of land which benefits from planning permission for a hotel
(ref. 69827/APP/2021/1565) and the Hyatt Hotel beyond. Low rise residential
properties form the character to the north of Uxbridge Road and are the closest
sensitive receptors to the site. There is also a live planning application for the
redevelopment of the site to deliver a flexible industrial warehouse development
(Use Classes E(g)(iii), B2 or B8) (ref. 1911/APP/2022/1853). The Hillingdon
Planning Committee has resolved to approve the application subject to
completion of a satisfactory S106 legal agreement. Please refer to Figure 2 for
a view of the site as seen from Uxbrid
ge Road.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
Figure 3: View of the Heathrow Interchange Site from Bullsbrook Road
2.3 The Heathrow Interchange site sits to the south of the Hayes Bridge Retail Park
site and measures approximately 1.2 hectares in area. The site is accessed off
Bullsbrook Road and comprises two linear industrial units, which share an open
yard. Unit 2, which is the southern half of the eastern industrial unit, is outside of
Colt's ownership and is not subject to the proposed development. The site is
bound by Bullsbrook Road to the north, Brook Industrial Estate to the east, the
Tudor Works site that Colt is redeveloping to deliver the two large data centre
buildings (LON4 and LON5) to the south (as approved under permission ref.
38421/APP/2021/4045), and a business park to the west. Please refer to Figure
3 for a view of the Heathrow Interchan
ge site as seen from Bullsbrook Road.
2.4 The sites are designated as part of the Springfield Road Strategic Industrial
Location as part of the Local Plan. The sites form part of Flood Zone 2, the Ossie
Garvin Air Quality Focus Area and the Hillingdon Air Quality Management Area.
The Yeading Brook runs to the east of the site, beyond which is the Paddington
Arm of the Grand Union Canal, both of which form part of London's Blue Ribbon
Network. The adjoining Grand Union Canal is designated as a Site of Importance
for Nature Conservation and forms part of the Canalside Conservation Area
designated within Ealing Borough. Transport for London's webCAT planning tool
confirms that the Public Transport Accessibility Level (PTAL) is very low and sits
between 0 and 2, with the Hayes Bridge Retail Park site being more accessible
than the Heathrow Interchan
ge site.
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3 Proposal
Figure 4: Proposed Site Massing Sketch (please note – a larger version of
sketch can be found in the Design and Access Statement)
3.1 This hybrid planning application seeks permission for a four-phased
redevelopment to deliver a data centre campus comprising of:
Phase 1 (LON6) - Full planning permission for (a) a data centre building; (b)
energy, power, and water infrastructure; (c) site access and internal roads
including a vehicular and pedestrian link between Uxbridge Road and Bullsbrook
Road; (d) site security arrangements and security fencing; (e) hard and soft,
green and blue, infras tructure; and (f) other ancillary and auxiliary forms of
development;
Phase 2 (Innovation Hub) - Outline planning permissionfor (a) an Innovation
Hub; (b) hard and soft, green and blue, infrastructure; and (c) other ancillary and
auxiliary forms of development (all matters reserved);
Phase 3 (LON7) - Outline planning permission for (a) a data centre building;
(b) energy, power, and water infrastructure; (c) internal roads; (d) site security
arrangements and security fencing; (e) hard and soft, green and blue,
infrastructure; and (f) other ancillary and auxiliary forms of development (all
matters reserved); and
Phase 4 (LON8) - Outline planning permission for (a) a data centre building;
(b) energy, power, and water infrastructure; (c) internal roads; (d) site security
arrangements and security fencing; (e) hard and soft, green and blue,
infrastructure; and (f) other ancillary and auxiliary forms of development (all
matters reserved
).
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PART 1 – Members, Public & Press
Figure 5: Proposed Parameter Site Plan (please note – a larger version of plan
can be found in the Committee Plan Pack)
3.2 As can be seen in Figure 5 for the proposed site parameter plan, Full planning
permission is sought for data centre LON6 which is located on the northern half
of the Hayes Bridge Retail Park site. This also includes the access road and
associated landscapin
g, and land adjoining the Yeading Brook.
3.3 Outline planning permission is sought for all of the remaining phases, including
Phases 2, 3 and 4. Phase 2 seeks permission for an Innovation Hub which is
classed as a Sui Generis use, for the purposes of creating and growing
technology-based start-up businesses, while also acting as a space that can be
used by the community on a more ad hoc basis. The space is proposed to be an
affordable workspace and the intention is that it would be occupied by Brunel
Universit
y, although it is noted that this is not guaranteed.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
3.4 Outline planning permission is sought for Phases 3 and 4 which comprises two
further data centre buildings. LON7 is to be located on the southern half of the
Hayes Bridge Retail Park site and LON8 is to be located on the Heathrow
Interchan
ge site.
3.5 As Phases 2, 3 and 4 are for Outline planning permission, the plans submitted
relating to these phases are indicative and are supported by Parameter Plans
and a Design Code. The Parameter Plans indicate the maximum extent of these
elements of development and the Design Code sets out core design principles
that the Outline phases must abide by when submitted for approval under the
Reserved Matters stage of the planning application process. As such, these
plans define the land use, and the maximum floorspace, heights, roof plans and
landscape.
3.6 Using the Parameter Plans and supporting documentation, the proposal is
summarised as follows:
x Phase 1 – LON6 (Full Planning Permission)
o Land Use: Class B8
o Floorspace: 24,114m2 GIA / 25,235m2 GEA
o Height:
Data centre wings: up to 42m (72000+AOD)
Central office: up to 37m (67000+AOD)
o Roof plan: to include amenity terrace, brown roof and PVs
o Generators: 20 no. diesel generators
x Phase 2 – Innovation Hub (Outline Planning Permission)
o Land Use: Sui Generis
o Floorspace: 2,000m2 GEA
o Height: Minimum 18m (48000+AOD) / Maximum 28m
(58000+AOD)
o Roof plan: to include amenity terrace
o Generators: 0 (zero) diesel generators
x Phase 3 – LON7 (Outline Planning Permission)
o Land Use: Class B8
o Floorspace: 53,415m2 GEA
o Height:
Data centre north: up to 56m (86000+AOD)
Data centre south: up to 47m (77000+AOD)
Central office: up to 41m (71000+AOD)
o Roof plan: to include amenity terrace, brown roof and PVs
o Generators: 38 no. diesel generators
x Phase 4 – LON8 (Outline Planning Permission)
o Land Use: Class B8
o Floorspace: 29,656m2 GEA
o Height: up to 40m (70000+AOD)
o Roof plan: to include amenity terrace
o Generators: 15 no. diesel
generators
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PART 1 – Members, Public & Press
4 Relevant Planning History
4.1 A list of the relevant planning history related to the property can be found in
Appendix 2.
Figure 6: Photo of the LON4 data centre approved under planning
permission ref. 38421/APP/2021/4045
4.2 The land at Tudor Works, Beaconsfield Road, application reference
38421/APP/2021/4045 (dated 25.11.22) granted permission for:
x Redevelopment of the site to deliver data centre campus including: two
data centre buildings (Use Class B8); associated energy and electricity
infrastructure, buildings, and plant; security gatehouse, systems and
enclosures; works to the highway, car parking and cycle parking; hard and
soft landscaping; as well as associated infrastructure, ancillary office use,
and associated external works.
This is in effect the first part of the data centre campus, comprising LON4 and
LON5. The development is currently being built out in phases, starting with
LON4. Please see Fi
gure 6 for a photo of LON4.
4.3 The Hayes Bridge Retail Park, Uxbridge Road, application reference
1911/APP/2022/1853 was resolved to grant at Planning Committee in December
2023 for:
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PART 1 – Members, Public & Press
x Demolition of existing buildings and erection of a single commercial
building for employment purposes Class E(g)iii, B2 and B8, along with
ancillary offices, gatehouse, associated infrastructure including; service
yard, car parking, drainage and hard and soft landscaping.
A Section 106 legal agreement has not been agreed and completed on this
application and as such the application has not been approved. It is, however, a
material planning consideration and establishes that the loss of the retail park
and use of the site for B8 as acceptable.
4.4 Application references 71554/APP/2024/2490 (dated 16-10-24),
1911/APP/2025/398 (dated 20-03-25) and 71554/APP/2025/466 (dated 18-03-
25) was granted consent under Schedule 2, Part 11, Class B of the Town and
Country Planning (General Permitted Development) (England) Order (2015) (as
amended) for the demolition of Units 1, 3 and 4 Heathrow Interchange and Hayes
Bridge Retail Park. On the basis that demolition is carried out within 5 years of
each respective permission, these applications have established the loss of
these buildings as acceptable. It is understood that Unit 1 Heathrow Interchange
has alread
y been demolished.
Application reference 71554/APP/2025/47 granted consent for the
redevelopment of the Unit 1 Heathrow Interchange site to deliver a substation in
connection with the permitted and emerging data centre campus. This is a
material plannin
g consideration.
5
Planning Policy
5.1 A list of planning policies relevant to the consideration of the application can be
found in Appendix 3.
6 Consultations and Representations
6.1 A total of 352 no. letters were sent to neighbouring properties on 31
st March
2025, a site notice was displayed to the front of the site and an advert was posted
in the local paper. All forms of consultation expired on 4
th May 2025. One
objection was received from a neighbouring property.
6.2 Representations received in response to public consultation are summarised in
Table 1 (below). Consultee responses received are summarised in Table 2
(below). Full copies of the responses have also separately been made available
to Members.
Table 1: Summar
y of Representations Received
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PART 1 – Members, Public & Press
Representations Summary of Issues
Raised
Planning Officer
Response
One letter of
objection was
received from a
neighbouring
property.
1. The development will
erode the value of
neighbouring businesses
who have resided in
Hillingdon for many years
and contributed significant
money to Council through
taxes and business rates.
The neighbouring business
comments are noted and
taken into consideration as
part of the overall planning
assessment.
More specifically, it is
noted that, whilst the
proposal would sit within
very close proximity to
neighbouring businesses,
the plans and proposed
operation do not indicate a
development which would
significantly compromise
the efficient operation of
neighbouring businesses.
Vehicle and pedestrian
access would be
maintained and any use
(or misuse) of access
rights are considered to be
a civil matter.
Table 2: Summary of Consultee Responses
Consultee and Summary of Comments
Planning Officer
Response
External Consultation
Affinity Water:
Water quality
The site is not located within an Environment
Agency defined groundwater Source
Protection Zone (SPZ) or close to our
abstractions. The construction works and
operation of the proposed development site
should be done in accordance with the
relevant British Standards and Best
Management Practices, thereby significantly
reducing the groundwater pollution risk. It
should be noted that the construction works
may exacerbate any existing pollution. If any
pollution is found at the site then the
The Affinity Water
comments are noted.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
appropriate monitoring and remediation
methods will need to be undertaken.
For any works involving excavations below the
chalk groundwater table (for example, piling or
the implementation of a geothermal
open/closed loop system), a ground
investigation should first be carried out to
identify appropriate techniques and to avoid
displacing any shallow contamination to a
greater depth, which could impact the chalk
aquifer.
For further information we refer you to CIRIA
Publication C532 "Control of water pollution
from construction - guidance for consultants
and contractors".
Water efficiency
Being within a water stressed area, we expect
that the development includes water efficient
fixtures and fittings. Measures such as
rainwater harvesting and grey water recycling
help the environment by reducing pressure for
abstractions. They also minimise potable
water use by reducing the amount of potable
water used for washing, cleaning and watering
gardens. This in turn reduces the carbon
emissions associated with treating this water
to a standard suitable for drinking and will help
in our efforts to get emissions down in the
borough.
Infrastructure connections and diversions
There are potentially water mains running
through or near to part of proposed
development site. If the development goes
ahead as proposed, the applicant/developer
will need to get in contact with our Developer
Services Team to discuss asset protection or
diversionary measures. This can be done
through the My Developments Portal
(https://affinitywater.custhelp.com/) or
aw_developerservices@custhelp.com.
Due to its location, Affinity Water will supply
drinkin
g water to the development in the event
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
that it is constructed. Should planning
permission be granted, the applicant is also
advised to contact Developer Services as
soon as possible regarding supply matters
due to the increased demand for water in the
area resulting from this development.
Canal and River Trust:
The Heritage, Townscape and Visual Impact
Assessment has included the canal within its
assessment and it is clear that the proposals
would be visible from the towpath and canal at
various points within about a kilometre vicinity.
However, these views would be generally
seen set back behind intervening-built form,
reducing the dominance of the proposals in
the view. The retention of the band of trees
along the brook to the east of the site would
also contribute to mitigating the visual impact
of the proposals from the canal. The current
landscaping proposals for the site also appear
appropriate and we would encourage the use
of native species and Plants for Pollinators
wherever possible.
The Transport Assessment predicts a net
reduction of travel to the site on foot or by bike
and so the direct impacts from the
development to the towpath would seem to be
limited.
The Canal and River Trust
Comments are noted.
Denham Aerodrome Safeguarding:
No response received.
n/a
Ealing Council:
Ealing Council acknowledged the request for
comment but did not provide any comment.
n/a
Environment Agency:
We have no objection to the proposed
development; however, we would like to
The Environment Agency
comments are noted.
Hillingdon Planning Committee – 2nd October 2025
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highlight that this is in relation to Phase 1 of
the development only. Further consultation
would be required on phases 2, 3 and 4.
Greater London Authority (GLA) (Stage 1):
Strategic issues summary
Land use principles: The redevelopment of
this SIL site to provide three data centres and
a research ‘Innovation Hub’ is supported in
land use terms.
Data Centre Energy Infrastructure: Further
information is sought on a number of key
elements prior to determination, including but
not limited to national grid connections.
Urban design: Generally supportive of the
design, layout and height in this location and
welcome the provision of the design code.
Transport: Further details are required on
public realm and active travel improvement
contributions and trip generation. The
applicant is requested to reduce the level of
car parking and increase the level and quality
of cycle parking to comply with the London
Plan.
Other issues on energy, circular economy,
whole-life carbon, and biodiversity also
require resolution prior to the Mayor’s decision
making stage.
Recommendation
That Hillingdon Council be advised that the
application does not yet fully comply with the
London Plan for the reasons set out in
paragraph 72. Outstanding matters relating to
data centre energy infrastructure, transport
and sustainable development should be
addressed.
The GLA’s Stage 1
comments are noted.
Regarding data centre
energy infrastructure, further
information has been
provided in respect of the
site’s connection to the
national grid. Please refer to
paras 7.13 to 7.18. Officers
are satisfied that this has
been sufficiently addressed,
and any further clarification
can be provided to the GLA
as part of the Stage 2
referral process.
Regarding transport, a
revised Transport
Assessment has been
submitted. The level of car
parking is acceptable for the
data centre use proposed
and a reason for refusal on
the basis of car parking
provision is not considered
to be reasonable or robust.
The detail of cycle parking is
proposed to be secured
under Conditions 27, 57, 87
and 117. The junction
improvement works would
be secured via a S278
highways agreement as per
S106 HoT viii. A contribution
towards active travel zone
measures and healthy
streets is also proposed to
be secured under S106 HoT
vii.
Comments raised in respect
of energy, circular economy,
whole-life carbon, and
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
biodiversity are addressed
within the relevant parts of
the report. References are
listed as follows:
x Energy – paras 7.125
to 7.126.
x Circular economy –
paras 7.133 to 7.136.
x Whole-life carbon –
paras 7.123 to 7.124.
x Biodiversity – paras
7.88 to 7.91.
Any further GLA comments
on these matters can also
be resolved via the Stage 2
referral process.
Greater London Archaeological Advisory
Service (GLAAS):
The proposed development would involve
extensive groundworks including basements
so there would likely be a high impact on any
surviving deposits of archaeological interest.
Mitigation will need to bear in mind the phased
nature of the development and the importance
of geoarchaeologists working with the
geotechnical team to develop a Pleistocene
geological deposit model to assess
archaeological potential.
Whilst opportunities for public benefit will
depend to a degree on what is found there is
potential for both on-site interpretation and/or
engaging local schools in learning about
Haye’s early prehistory with its deep time-
depth story of climate annd environmental
change.
A written scheme of investigation (WSI)
should be secured by planning condition.
The GLAAS comments are
noted. Please refer to paras
7.64 to 7.65 and Conditions
18, 48, 78 and 108.
Health and Safety Executive (HSE):
The HSE comments are
noted.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
The development is not a “relevant building”
which requires consultation with HSE from a
fire safety perspective as it does not contain
residential or educational accommodation.
Correspondence has also been received
regarding the fuel safety case and indicates
that HSE do not consider Control of Major
Accident Hazards (COMAH) to be applicable.
It is also noted that the site
is not located within the
HSE High Pressure Gas
Pipeline zone of
consultation.
Heathrow Airport Safeguarding:
The proposed development has been
examined from an aerodrome safeguarding
perspective and could conflict with
safeguarding criteria unless any planning
permission granted is subject to planning
conditions for a Bird Hazard Management
Plan for each phase.
The Heathrow Airport
Safeguarding comments are
noted. Please refer to paras
8.4 to 8.5 and Conditions
29, 59, 89, 119.
London Fire Brigade:
No comment received.
n/a
Metropolitan Police (Secured by Design):
No comment received.
n/a
Metropolitan Police (Counter Terrorism):
No comment received.
n/a
Ministry of Defence (MoD):
The proposed development would be
considered to have no detrimental impact on
the operation or capability of a Defence site or
asset. The MOD, therefore, has no objection
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The MoD comments are
noted.
National Air Traffic Services (NATS):
The proposed development does not conflict
with NATS safeguarding criteria. Accordingly,
NATS (En Route) Public Limited Company
("NERL") has no safeguarding objection to the
proposal.
The NATS comments are
noted.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
Thames Water:
Waste Comments
As you are redeveloping a site, there may be
public sewers crossing or close to your
development. If you discover a sewer, it's
important that you minimize the risk of
damage. We’ll need to check that your
development doesn’t limit repair or
maintenance activities, or inhibit the services
we provide in any other way.
The application indicates that SURFACE
WATER will NOT be discharged to the public
network and as such Thames Water has no
objection, however approval should be sought
from the Lead Local Flood Authority. Should
the applicant subsequently seek a connection
to discharge surface water into the public
network in the future then we would consider
this to be a material change to the proposal,
which would require an amendment to the
application at which point we would need to
review our position.
Thames Water would advise that with regard
to FOUL WATER sewerage network
infrastructure capacity, we would not have any
objection to the above planning application,
based on the information provided.
Water Comments
With regard to water supply, this comes within
the area covered by the Affinity Water
Company.
The Thames Water
comments are noted.
Transport for London (TfL):
- Improvements to the site access agreed as
part of the extant permission should be re-
secured;
- A reduction in the quantum of car parking at
this site is sought;
- A contribution towards improving the active
travel environment beyond the red line
boundary should be secured;
The Transport for London
comments are noted.
A revised Transport
Assessment was submitted
in response to the TfL
comments.
The Highways Authority
consider the level of car
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
- An increase in the quantum of cycle parking
provision is required to comply with the
minimum standards identified within the
London Plan is required;
- A DSP, CLP, Travel Plan and PDMP should
be secured through the appropriate
mechanism.
parking to be acceptable for
the data centre use
proposed and a reason for
refusal on the basis of car
parking provision is not
considered to be reasonable
or robust.
Please refer to paras 7.105
to 7.122 for consideration of
transport matters.
The detail of cycle parking is
proposed to be secured
under Conditions 27, 57, 87
and 117.
A Delivery & Servicing Plan
is to be secured for each
phase, under Conditions 38,
69, 99 and 129.
A Construction
Environmental Management
and Logistics Plan is to be
secured for each phase,
under Conditions 16, 46, 76,
and 106.
A Parking Design and
Management Plan is to be
secured for each phase,
under Conditions 37, 68, 98,
128.
A travel plan is to be
secured for each phase,
under S106 HoT vi.
The Uxbridge Road junction
improvement works would
be secured via a S278
highways agreement as per
S106 HoT viii. A contribution
towards active travel zone
measures and healthy
streets is also proposed to
be secured under S106 HoT
vii.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
Transport for London Infrastructure
Protection:
No comment.
n/a
Internal Consultation
Access Officer:
No objection subject to a condition which
secures details and provision of inclusive
access, including ramped/level approaches,
accessible toilets, types and dimensions of
door width and lobby openings, and a fire
evacuation lift designed to meet the technical
standards set out in BS EN 81-76, BS 9991
and/or BS 9999.
The Access Officer
comments are noted.
Matters relating to access
are addressed in paras 7.52
to 7.53.
Please refer to Conditions
26, 56, 86 and 116.
Air Quality Officer:
The proposed data centre building (Class B8)
with 74 no. emergency generators and
associated flues is not air quality neutral as
required by the London Plan, not air quality
neutral as per LBH Air Quality Local Action
Plan 2019-2024, and not air quality positive,
as required by the LBH Local Action Plan.
Therefore, further mitigation is required.
The total level of mitigation required to the
proposed development for pollutant emissions
is based on the use of a CAT generator and
equals £1,026,166 for Phase 1 (LON6). The
contributions for Phases 2, 3 and 4 shall be
calculated under a reserved matters
application.
This should be secured by S106 legal
agreement.
Conditions are also proposed for the following:
x Compliance with Air Quality Emissions
x Backup Generator Fuel
x Non-Road Mobile Machinery
x Reducing Emissions from Demolition
and Construction
x Cleanest Generator and Fuel
Technology
The Air Quality Officer
comments are noted.
Please refer to paras 7.76 to
7.81, S106 HoT i and
Conditions 11, 12, 13, 14,
32, 33, 34, 35, 36, 44, 63,
64, 65, 66, 67, 75, 93, 94,
95, 96, 97, 105, 123, 124,
125, 126, 127, and 135.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
x SCR to achieve 95mg/Nm3
x Operating Regime for Backup
Generators
x Emission Reduction and Management
Plan
x Emissions Monitoring Plan
x Backup Generator Emission Evidence
Contaminated Land Officer:
No objection subject to a planning condition
securing further details.
The Contaminated Land
Officer comments are noted.
Conditions 17, 47, 77, 107
are proposed to be secured.
Economic Development Officer:
An employment strategy and construction
training scheme should be secured by S106
legal agreement.
The long-term use of the innovation hub for its
intended purpose should be secured through
legal agreement with the developer, to ensure
that the space retains its use as an innovation
hub in perpetuity. This should include an
obligation for the landowner to find a suitable
replacement tenant that delivers the same
level of community benefit, under similar
rental terms, should Brunel University leave
the space in the future.
The Innovation Hub must be used for its
intended purpose. Any café provisions should
be open to the public. The developer is
required to formalise the arrangement of
peppercorn rent for similar future uses.
All jobs created by end users must be
promoted through local employment partners
identified by LBH. Where 10 or more
opportunities are available, the end user must
work with LBH to establish a sector-based
academy, providing short training
programmes to help local residents access
these roles.
The Economic Development
Officer comments are noted.
Please refer to Conditions
15 and 45 to secure the
delivery of the Phase 2
Innovation Hub
development in conjunction
with the Phase 1 LON6 data
centre development and the
provision of publicly
accessible floorspace for
sale of food and/or drink
(Classes E (a) and/or E (b))
as ancillary to the main use.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
Flood and Water Management Specialist
(Metis):
No objection is raised subject to conditions
securing the final details and implementation
of the drainage strategy.
The Flood and Water
Management Specialist
comments are noted.
Conditions 19, 20, 30, 49,
50, 60, 79, 80, 90, 109, 110,
and 120 are proposed to be
secured.
Head of Environmental Specialists
(Sustainability):
Conditions and a S106 obligation should be
secured to ensure policy compliance for
carbon emissions.
A condition should be secured for the waste
heat strategy as it is not clear how waste heat
will be used.
The water cycle strategy does not detail water
consumption rates. A condition capturing
more information and details linked to
drainage would be sufficient to resolve this
matter.
The Head of Environmental
Specialists comments are
noted.
Conditions 31, 61, 91, and
121 are proposed to secure
an updated energy strategy,
including monitoring,
recording and reporting
plans for each phase.
S106 HoT v is proposed to
secure an updated energy
strategy and carbon offset
contribution.
Conditions 21, 51, 81, and
111 are proposed to secure
further details on waste
heat.
Conditions 19, 20, 30, 49,
50, 60, 79, 80, 90, 109, 110,
and 120 are proposed to
secure further details on the
water cycle and drainage
strategy.
Highways Authority:
The car parking and cycle parking proposed is
accepted.
The Transport Assessment submitted reports
that if all the existing retail units were trading
then this and Heathrow Interchange Park
would
generate a daily total of 4,901no.
The Highways Authority
comments are noted.
Please refer to paras 7.105
to 7.122 for consideration of
transport matters.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
private car/van movements. This would fall to
1,002no. if the site was redeveloped as 3no.
new data centres and an innovation hub, a
reduction of 3,899no. daily private car/van
trips. This decrease in private car or van trip
generation is as would be expected and is
welcomed by the Highway Authority as it
would help alleviate road traffic congestion of
the surrounding road network.
Active Travel Zone Assessment
The Highway Authority requires the developer
to enter a Town and Country Planning Act
s.106 legal agreement with the Council
obliging them to enter a Highways Act s.278
agreement allowing them to remodel the
junction bellmouth to include a straight across
toucan crossing for cyclists and pedestrians at
the site entrance.
In addition to the above the Highway Authority
requires the applicant to enter a s.106
agreement with the Council to fund the Active
Travel Healthy Streets works listed below.
Much of this originates from the applicants
own Active Travel Zone assessment though
the Council has added school road safety
scheme works identified in a consultant’s
study. These works would improve road
safety around Minet Junior, Infant and Nursery
School, Avondale Drive and benefit to people
walking along the Active Travel Zone
assessment route No.2a which links Hayes
and Harlington Station with the application
site. The works include the installation of new
Wig Wag warning signs; these are those signs
that have the speed limit indicated together
with flashing amber lights (the "wig-wags")
that alternate back and forth.
The cost of these works totals £209,660.
Conclusions
There are no highway objections to this
proposal subject to securing the necessary
planning conditions and S106 legal
obli
gations.
The detail of cycle parking is
proposed to be secured
under Conditions 27, 57, 87
and 117.
A Delivery & Servicing Plan
is to be secured for each
phase, under Conditions 38,
69, 99 and 129.
A Construction
Environmental Management
and Logistics Plan is to be
secured for each phase,
under Conditions 16, 46, 76,
and 106.
A Parking Design and
Management Plan is to be
secured for each phase,
under Conditions 37, 68, 98,
128.
A travel plan is to be
secured for each phase,
under S106 HoT vi.
The Uxbridge Road junction
improvement works would
be secured via a S278
highways agreement as per
S106 HoT viii. A contribution
towards active travel zone
measures and healthy
streets is also proposed to
be secured under S106 HoT
vii.
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
Noise Specialist:
Sufficient information has been provided by
the Applicant to make a recommendation with
respect to noise. It is recommended that no
objection is made on noise grounds subject to
conditions which limit noise levels.
The Noise Specialist
comments are noted.
Matters relating to noise are
addressed in paras 7.70 to
7.73 of the report.
Please also refer to
Condition 10.
Planning Policy Officer:
Principle:
The site is located within the off Springfield
Road Industrial Area, which is designated as a
Strategic Industrial Location (SIL) in both the
London Plan (2021) and the Local Plan: Part
2. The precedent has been set on other sites
within the borough that these are appropriate
locations for new data centres and that they
meet the definition provided within Paragraph
6.4.1 of the London Plan. The existing use
does not meet the definition provided within
Paragraph 6.4.1 of the London Plan. In
addition, the London Plan supports the
intensification of industrial uses in industrial
areas. Therefore, no objection is raised to the
principle of locating a data centre in this
location.
Power:
The applicant has stated that a total of 250
MW has been secured in 3 phases from two
different National Grid points. Initially (October
2027) 99 MW has been secured from North
Hyde. An additional 51 MW would be supplied
from October 2029. The remaining 100 MW
will be supplied from Uxbridge Moor/Iver B
from November 2029.
Innovation Hub:
The Innovation Hub / affordable workspace
will need to be secured by S106 legal
a
greement.
The Planning Policy Officer
comments are noted.
Please refer to the following
sections of the report for
consideration of relevant
matters:
x Principle of data
centre development –
paras 7.1 to 7.5
x Innovation hub –
paras 7.6 to 7.8
x Power and energy
infrastructure – paras
7.13 to 7.18
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
Urban Design Officer:
Overall the revised version of the Design
Code is considered an improvement. The
structure and choice of wording was altered
positively and there is now a clear
differentiation between obligation (must) and
advice (should).
The design of the Phase 1 element is
acceptable on balance and the Design Code
for Phase 2/3 is developed in accordance with
Phase 1.
Considering that the development occupies a
strategic location, it is important that the
development appears attractive during
daytime as well as at nighttime. As the
development comprises several tall buildings,
forming a significant campus, a coherent
signage strategy and lighting strategy is of
essence. Furthermore, a clear signage
strategy contributes towards the creation of a
high-quality landmark development greeting
Hillingdon’s visitors and residents approaching
from Ealing.
The most important element of the campus is
arguably the Innovation Hub, as this building
fronts Uxbridge Road and will conceal the
shear mass of the 11 storey data halls. The
Design Code sets out a frame work for a high-
quality approach, however an initial draft
submission struggles to achieve the Code.
The Urban Design Officer
comments are noted.
Matters relating to design
are addressed in paras 7.21
to 7.51 of the report.
The final design details of
the materials and landscape
scheme are proposed to be
secured by Conditions 23,
24, 25, 26, 27, 53, 54, 55,
56, 57, 83, 84, 85, 86, 87,
113, 114, 115, 116, and
117.
Waste Strategy Officer:
No comments/ objections.
The Waste Strategy Officer
comments are noted.
7 Planning Assessment
Land Use Principles
Loss of Existing Uses and Proposed Data Centre Use
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
7.1 The application site is located within the Hayes Strategic Industrial Location (SIL)
in the Hillingdon Local Plan. SILs are key locations for industrial, logistics, and
digital infrastructure uses, ensuring that such areas continue to support London's
economic and emplo
yment needs.
7.2 The development would demolish the existing and largely vacant low density
out-of-town centre Hayes Bridge Retail Park and Heathrow Interchange Class
B8 warehouses and replace them with a hyperscale data centre campus, to
connect to an established data centre development on land at Tudor Works
located to the south on Beaconsfield Road.
7.3 The Hayes Bridge Retail Park element of the site is an out-of-town centre retail
park. The site is not a sequentially preferable location for main town centres uses
and there are no policies in the Development Plan which requires the site to be
retained as an out-of-town centre retail park.
7.4 Units 1, 3 and 4 Heathrow Interchange comprise B8 Class warehouse buildings,
located within the designated SIL. Policy E4 of the London Plan (2021)
recognises data centres as an emerging industrial-type activity that falls within
the broader B8 (storage and distribution) classification. The loss of the
warehouses and replacement within an appropriate SIL use is accepted.
7.5 Policy E7 of the London Plan (2021) encourages the intensification of industrial
land, particularly in SILs, to optimise capacity while ensuring that existing
industrial functions are not compromi sed. The proposed development would
deliver 24,114m2 floorspace (GIA) for the LON6 data centre (Phase 1), up to a
maximum of 83,071m2 for the LON7 and LON8 data centres (Phases 3 and 4)
and up to 2,000m2 for the Innovation Hub (Phase 2). As such, the development
would appropriatel
y intensify the use of the site in accordance with policy.
Innovation Hub
7.6 Policy E3 (Affordable workspace) of the London Plan (2021) states planning
obligations may be used to secure affordable workspace (in the B Use Class) at
rents maintained below the market rate for that space for a specific social,
cultural or economic development purpose.
7.7 The Innovation Hub (Sui Generis) is proposed for the purposes of creating and
growing technology-based start-up businesses, whilst also acting as a space that
can be used by the community on a more ad hoc basis. The space is proposed
to be an affordable workspace and the intention is that it would be occupied by
Brunel University, although it is noted that this is not guaranteed. The Innovation
Hub would be ancillary to the data centre use and would not compromise the
industrial functions of the SIL. As such, the land use principle is supported.
7.8 The proposed affordable workspace use is supported, particularly with reference
to a potential partnership with Brunel University. It is considered that if the space
is secured as genuinely affordable, as subsidised by Colt with long term
peppercorn rents, then the proposal is supported in polic
y terms. This is
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
proposed to be secured by a Section 106 legal agreement (please refer to S106
HoT i).
Employment
7.9 It is noted that Policy E2 of the London Plan (2021) requires that B Use Class
business uses should be fit for purpose. Policy E4 of the London Plan (2021)
states that additional industrial capacity should be prioritised in locations that are
accessible.
7.10 The are circa 100 full-time employees (FTE) if all retail and warehouse units are
fully let. The Economic Impact Assessment (Dated March 2025) explains the
economic impact and multiplier effects of data centres on the UK economy.
Specifically, the proposal would increase the number of jobs generated on site
to 232 FTE. It is also estimated that the development will generate 251 FTE net
additional jobs per annum when accounting for multiplier effects of data centres.
Jobs in data centres tend to be highl y skilled and theref ore command higher
salaries compared to more traditional sites and industries. This job creation
wei
ghs in favour of the scheme in the planning balance.
7.11 Policy E11 of the London Plan (2021) states that development proposals should
support employment, skills development, apprenticeships, and other education
and training opportunities in both the construction and end-use phases, including
through Section 106 obligations where appropriate. In accordance with this, the
Council's Planning Obligations Supplementary Planning Document (2014)
requires that developments with estimated construction costs of over £2 million
and a construction period of three months or more deliver an in-kind employment
and training scheme or financial contributions towards training and employment
in the borough. An employment strategy and construction training scheme is
proposed to be secured b
y a Section 106 legal agreement under HoT ix.
Economy
7.12 The economic benefit of information and communications technology
infrastructure is acknowledged and supported by national, regional and local
planning policies. As noted under Paragraph 85 of the National Planning Policy
Framework (2024), significant weight should be placed on the need to support
economic growth and produc tivity. There will be substantial economic benefits
arising from the proposed development in terms of employment. The national
non-domestic rates (NNDR) and gross value added (GVA) increases are also
significant. There is need for additional data capacity to be located within London
to be as close as possible to its end users and support the broader economy.
These benefits and considerations are given significant weight in the overall
assessment of the plannin
g balance.
Power Infrastructure
7.13 The NPPF (2024) emphasises the need for development to be supported by
appropriate infrastructure. Polic
y D2 of the London Plan requires consideration
Hillingdon Planning Committee – 2nd October 2025
PART 1 – Members, Public & Press
to be given to the impact on local infrastructure capacity where planning
infrastructure capacity will be exceeded. Policy SI2 of the London Plan (2021)
requires major developments to demonstr ate how energy infrastructure will be
integrated and supported.
7.14 The site is within the area of west London served by the Distribution Network
Operator SSEN, which is currently subject to on-going electricity capacity
constraints. It is understood that an agreement has been made with National
Grid and SSEN to provide power to the site. In the Utility Statement the applicant
states an SSEN 1000kVA supply will be located at the north of the site to provide
720kVA to Hayes Bridge Digital Park including the Innovation hub. The North
Hyde National Grid connection made by the applicant to power the site is a
connection to one of the known constrained grid supply points within the West
London area.
7.15 As the development has secured a power supply, it is concluded that it would
not overburden the local grid capacity (by virtue of securing the power which
would not be possible otherwise). Based on the information available to Officers,
the development is not considered to result in detrimental impacts connected to
ener
gy infrastructure.
7.16 The GLA have commented that stretch connections generate significant
environmental impacts in construction in terms of emission of pollutants, noise,
vibration, the creation of nuisances, and in the disposal of waste associated with
the works. The LPA do not disagree, however, there is a difference of opinion as
to how this matter is formall
y considered.
7.17 Stretch connections are typically carried out through permitted development
rights. Whilst permitted development rights are not applicable to EIA
development, the Applicant's position is that the stretch connections are not the
"development", i.e. the development is what is proposed within the red line
boundar
y.
7.18 All development requires some form of stretch connection one way or another.
Only the specific context of those stretch connections would change whether it
is EIA development and requires planning permission. For example, the relevant
considerations could include length of the connections, the route of the
connections and constraints on the land (including any sensitivities) which would
be impacted by those connections. As such, the Applicant has been invited to
confirm the stretch connection route in order to determine whether it is permitted
development or EIA development. However, the matter does not form a robust
reason for refusal and is not a matter which should prevent the application being
considered by Committee, noting that the GLA Stage 2 referral process could
also serve as a platform for further clarification on this point.
Design
7.19 This application seeks Full planning permission for data centre LON6 (Phase 1)
which is located on the northern half of the Ha
yes Bridge Retail Park site. Outline
Text extracted automatically from the PDF, so layout, tables and images are not shown. Only the start of this long document is shown here. Open the original PDF on LB Hillingdon’s website.