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Integrated Security Solutions (ISS) Works at Walham and Pentir

NATIONAL GRID ELECTRICITY TRANSMISSION PLC

This public procurement record has 2 releases in its history.

Tender

09 Oct 2026 at 14:43

UK4 - Tender Notice
Planning

17 Aug 2026 at 16:19

UK3 - Planned Procurement Notice
Summary of the contracting process

National Grid Electricity Transmission PLC is seeking contractors to design and deliver integrated security works for two critical national infrastructure sites: Walham in Gloucestershire and Pentir in Gwynedd. The works cover security and surveillance systems, including CCTV and alarms, alongside fencing, gates, telecommunications installation and associated engineering and construction. The procurement is split into two site-specific lots, so suppliers can target Walham, Pentir or both. The requirement includes early contractor involvement: initial work covers design development, buildability, risk reduction, programme optimisation and preparation of an open-book target cost, with construction potentially following. The buyer may decide not to proceed to the construction stage after reviewing the target cost, risk reduction, business case and funding.

The buyer invited offers through a multi-stage competitive flexible procedure. Suppliers first complete pre-qualification; selected suppliers proceed to a request-for-proposal stage, which may include evaluation, negotiation and resubmission. Expressions of interest were due by 19 October 2026 at 23:59 UK time; suppliers were asked to register by 16 October for platform onboarding. The estimated award decision date is 1 February 2027. Both contracts are planned to run from 17 May 2027 to 14 January 2028. Walham is valued at £9 million excluding VAT (£10.8 million including VAT); Pentir at £12 million excluding VAT (£14.4 million including VAT). Technical quality carries 75% of the evaluation score and commercial cost 25%. A supplier may bid for either or both lots but can win no more than one.

This opportunity suits established security and engineering contractors able to deliver integrated systems at critical infrastructure sites, combining design and construction capability. Suppliers need to evidence relevant technical experience, competent resources, appropriate systems and organisational capacity, alongside sound financial standing and the ability to meet applicable legal, statutory and regulatory requirements. National Grid’s standard supplier requirements and project-specific technical requirements apply; equivalent qualifications or accreditations are permitted. The early contractor involvement stage also calls for design development, buildability assessment, risk reduction, programme optimisation and open-book target-cost preparation. Businesses should be equipped to work under an NEC4 Engineering and Construction Contract, Option C, with the early contractor involvement option. The eventual construction stage depends on agreement of the target cost, satisfactory risk reduction, business-case approval and funding confirmation.

How relevant is this notice?

Notice Information

Notice Title

Integrated Security Solutions (ISS) Works at Walham and Pentir

Notice Description

National Grid Electricity Transmission Plc is seeking experienced and suitably qualified suppliers capable of delivering a fully integrated security solution for critical national infrastructure sites at Walham and Pentir. The requirement is divided into two separate Lots: Lot 1 (Walham) and Lot 2 (Pentir). Suppliers may submit tenders for one or both Lots; however, no supplier will be awarded more than one Lot. Further details in relation to the scope are set out in the Instructions to Tenderers.

Lot Information

Lot 1. ISS Walham, Gloucestershire

National Grid Electricity Transmission Plc is seeking an experienced and suitably qualified supplier capable of delivering a fully integrated security solution for a critical national infrastructure site at Walham.

Options: The Contract is based on the NEC4 ECC form of contract, which includes the right for the Project Manager to issue instructions to the Contractor which may have the impact of changing Key Dates/Completion Dates/the total of the Prices. Not all such instructions constitute modifications within the meaning set out in the Procurement Act 2023, but National Grid note the following Project Manager's instructions which may, depending on their content, give rise to modifications under the Procurement Act 2023 are permitted modifications (para 11 Schedule 8): * A Project Manager's instruction changing the Scope/ or the boundaries of the Site (clause 14.3, 60.1(1)); * A Project Manager's instruction to omit any part(s) of the Scope (clause Z23). The Client may also in accordance with ECI clause X22 i) issue a notice to proceed instructing the Contractor to complete Stage 2 of the works or b) issue an instruction that a notice to proceed to Stage 2 will not be issued and that the contract will terminate/ Stage 2 of the works will be removed from the Scope. This procurement is for the appointment of a contractor under NEC4 Engineering and Construction Contract Option C with Secondary Option X22 Early Contractor Involvement. The successful Contractor will initially be appointed to undertake Stage One ECI activities including design development, buildability assessments, risk reduction, programme optimisation and preparation of an open-book Target Cost. Following completion of Stage One the Client will determine whether to issue a notice to proceed for Stage Two construction activities. Progression to Stage Two is subject to agreement of the Target Cost, satisfactory risk reduction outcomes, business case approval and funding confirmation. If a notice that the works will not proceed to Stage Two is issued, the contract will terminate/Stage Two of the works will be removed from the Scope.

Lot 2. ISS Pentir, Gwynedd

National Grid Electricity Transmission Plc is seeking an experienced and suitably qualified supplier capable of delivering a fully integrated security solution for a critical national infrastructure site at Pentir.

Options: The Contract is based on the NEC4 ECC form of contract, which includes the right for the Project Manager to issue instructions to the Contractor which may have the impact of changing Key Dates/Completion Dates/the total of the Prices. Not all such instructions constitute modifications within the meaning set out in the Procurement Act 2023, but National Grid note the following Project Manager's instructions which may, depending on their content, give rise to modifications under the Procurement Act 2023 are permitted modifications (para 11 Schedule 8): * A Project Manager's instruction changing the Scope/ or the boundaries of the Site (clause 14.3, 60.1(1)); * A Project Manager's instruction to omit any part(s) of the Scope (clause Z23). The Client may also in accordance with ECI clause X22 i) issue a notice to proceed instructing the Contractor to complete Stage 2 of the works or b) issue an instruction that a notice to proceed to Stage 2 will not be issued and that the contract will terminate/ Stage 2 of the works will be removed from the Scope. This procurement is for the appointment of a contractor under NEC4 Engineering and Construction Contract Option C with Secondary Option X22 Early Contractor Involvement. The successful Contractor will initially be appointed to undertake Stage One ECI activities including design development, buildability assessments, risk reduction, programme optimisation and preparation of an open-book Target Cost. Following completion of Stage One the Client will determine whether to issue a notice to proceed for Stage Two construction activities. Progression to Stage Two is subject to agreement of the Target Cost, satisfactory risk reduction outcomes, business case approval and funding confirmation. If a notice that the works will not proceed to Stage Two is issued, the contract will terminate/Stage Two of the works will be removed from the Scope.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-h6vhtk-06e5ea
Publication Source
Find A Tender Service
Latest Notice
https://www.find-tender.service.gov.uk/Notice/095732-2026
Current Stage
Tender
All Stages
Planning, Tender

Procurement Classification

Notice Type
UK4 - Tender Notice
Procurement Type
Standard
Procurement Category
Works
Procurement Method
Selective
Procurement Method Details
Competitive flexible procedure
Tender Suitability
Not specified
Awardee Scale
Not specified

Common Procurement Vocabulary (CPV)

CPV Divisions

32 - Radio, television, communication, telecommunication and related equipment

34 - Transport equipment and auxiliary products to transportation

35 - Security, fire-fighting, police and defence equipment

44 - Construction structures and materials; auxiliary products to construction (except electric apparatus)

45 - Construction work

79 - Business services: law, marketing, consulting, recruitment, printing and security

CPV Codes

32235000 - Closed-circuit surveillance system

34928200 - Fences

35120000 - Surveillance and security systems and devices

44221300 - Gates

45220000 - Engineering works and construction works

45232220 - Substation construction work

45312100 - Fire-alarm system installation work

45312200 - Burglar-alarm system installation work

45314000 - Installation of telecommunications equipment

45340000 - Fencing, railing and safety equipment installation work

79415200 - Design consultancy services

79933000 - Design support services

Notice Value(s)

Tender Value
£21,000,000 £10M-£100M
Lots Value
£21,000,000 £10M-£100M
Awards Value
Not specified
Contracts Value
Not specified

Notice Dates

Publication Date
9 Oct 20263 days ago
Submission Deadline
Not specified
Future Notice Date
28 Sep 2026Expired
Award Date
Not specified
Contract Period
17 May 2027 - 14 Jan 2028 6-12 months
Recurrence
Not specified

Notice Status

Tender Status
Active
Lots Status
Active
Awards Status
Not Specified
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
NATIONAL GRID ELECTRICITY TRANSMISSION PLC
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
LONDON
Postcode
WC2N 5EH
Postcode Area
Central London
Country
England
Major Region (ITL 1)
TLI London
Basic Region (ITL 2)
TLI3 Inner London - West
Small Region (ITL 3)
TLI35 Westminster and City of London
Delivery Location
TLK South West (England), TLL Wales
Local Authority
Westminster
Electoral Ward
St James's
Westminster Constituency
Cities of London and Westminster

Further Information

Notice Documents

  • https://www.find-tender.service.gov.uk/Notice/095732-2026
    9th October 2026 - Tender notice on Find a Tender
  • https://www.find-tender.service.gov.uk/Notice/078250-2026
    17th August 2026 - Planned procurement notice on Find a Tender
  • https://forms.cloud.microsoft/r/3cr4ANRWaJ
    Please complete the Microsoft Form to submit an Expression of Interest to receive tender notice documentation. The information collected will be used as part of the first-stage SAP Ariba onboarding process for National Grid. All fields are mandatory to facilitate Supplier Lifecycle and Performance (SLP) pre-registration and should be completed accurately and in full. Following receipt of expressions of interest, an Ariba profile will be created and a questionnaire issued via Ariba to conclude onboarding. In addition, your organisation must be registered on the Central Digital Platform (CDP). If you have not yet registered, please do so using the following link: https://supplierregistration.cabinetoffice.gov.uk/login

Open Contracting Data Standard (OCDS)

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