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Find a TenderAdministrative changeContract change notice
Published 22 Apr 2025, 13:42 BST

This notice announces an administrative change to an existing contract or market (a contract change notice). No new tender or admission is opened here; see the linked notices below for the original opportunity.

Official UK procurement notice

Owner's Engineer · UK public procurement notice

Official notice

Authority: Great British Energy - Nuclear (Public body)

ServicesCompetitive flexible procedureAbove thresholdSME suitable
Sectors: Architecture & Engineering (71)Business Services & Consultancy (79) Delivery: UK
Published estimate£600,000,000≈ £43m / year · £720,000,000 inc. VAT
Submissions closed 9 Jul 2025awarded 9 Feb 2026
Awarded to Amentum Clean Energy Ltd, Cavendish Nuclear Limited2 awards
Contract term 14 yrsends 28 Mar 2040 · starts 26 Mar 2026

What is being bought

Published requirement description

The OE will provide essential independent assurance to the Intelligent Customer and Intelligent Client for the Small Modular Reactor project. This will support the deployment of first-of-a-kind nuclear technology in the UK and facilitate GBE-N's goal of reaching a Final Investment Decision. In particular, the OE will act as a 'client friend' to the Intelligent Customer and Intelligent Client and provide competent resource to undertake specification, oversight, audit, review and advice for decisions relating to design, scope, budget, risk, delivery and contract compliance. It will also play the role of subject matter expert to deliver independent technical and delivery Line of Defence 2 assurance on major design and build contracts.

The maximum total contract value is £300m. However, it is not possible to predict an exact outturn value at this stage due to the length of the contract and inherent uncertainties in scope, which drive variability in the volume of work instructed. In addition, progression through design stages and associated milestones or gates will determine the timing and extent of services required, potentially influencing the overall contract value over time.

As envisaged in the tender notice, the duration of the OE contract will depend on matters agreed with the SMR Technology Partner. The current assumption remains that the OE contract will have a 14-year term, but a completion date will be set during the term of the contract in accordance with its terms and to reflect the term of the SMR Technology Partner contract.

  • How the procedure runs: The Owner's Engineer (OE) will be procured using the Competitive Flexible Procedure outlined in the Procurement Act 2023 (the Act). There will be two stages in the OE procurement. In the first stage, tenderers will need to respond to the Procurement Specific Questionnaire (PSQ), which will include conditions of participation. The PSQ will cover topics including, but not limited to, conflicts of interest, economic and financial standing and the tenderer's ability to provide the technical and programme capabilities listed later in this notice. The capabilities set out in the technical ability conditions of participation section below can be delivered in various ways, including (but not limited to) by a tenderer and its supply chain, a joint venture, a special purpose vehicle or a consortium. Please note that while GBN considers this list of capabilities to be comprehensive, it reserves the right to change them (and any other information provided in this notice) by the time of launching the OE procurement. If the response submitted by a tenderer as part of the first stage of the procurement satisfies all the relevant conditions, the tenderer will be invited to submit a tender as part of the second stage of the procurement. GBN will then assess the tenderer's proposals against questions covering Technical, Commercial and Social Value criteria. Please note that GBN reserves the right to refine its award criteria during the procurement process. All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer. https://beisgroup.ukp.app.jaggaer.com/

CPV: Construction-related services · Engineering services · Safety consultancy services · Technical testing, analysis and consultancy services

The lotProcurement structure

single lot · value published
Lot #1Awarded 14 yrsSMEPublished value£600,000,000
Contract period: 26 Mar 2026 – 28 Mar 2040 (14 yrs)Value: £600,000,000 exc. VAT · £720,000,000 inc. VAT
Delivery: UKEligibility: SME eligible
71300000 Engineering services71500000 Construction-related services71600000 Technical testing, analysis and consultancy services79417000 Safety consultancy services
Pre-qualification & selection criteria (PQQ)2
  • Economic & financial standing

    Please refer to the Procurement Specific Questionnaire for a set of Economic and Financial Standing requirements, and conflicts of interest requirements

    All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer.

  • Technical & professional ability

    Please refer to the Procurement Specific Questionnaire for a set of technical and programme delivery skills and capabilities.

    All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer.

What it takes to win
i

How this buyer will score bids.

The evaluation criteria and weights exactly as published on the notice, grouped by family (price, quality, social value and so on).

Evaluation split and conditions of participation as published; the tender pack may add more
How bids were scored
Quality: 60%Price: 30%Social value: 10%
Published sub-criteria (3)
  • Technical Envelope: 60%
  • Commercial Envelope: 30%
  • Social Value Envelope: 10%
Published award criteria (3)
  • Technical Envelope: This is PSQ Stage, as such the Award Criteria may be refined at ITT stage. All PSQ questions are Pass Fail.
  • Social Value Envelope: This is PSQ Stage, the Award Criteria may be refined at ITT stage. All PSQ questions are Pass Fail.
  • Commercial Envelope: This is PSQ Stage, Award Criteria may be refined at ITT stage. All PSQ questions are Pass Fail.
Conditions of participation2
  • Economic & financial standing

    Please refer to the Procurement Specific Questionnaire for a set of Economic and Financial Standing requirements, and conflicts of interest requirements

    All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer.

  • Technical & professional ability

    Please refer to the Procurement Specific Questionnaire for a set of technical and programme delivery skills and capabilities.

    All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer.

What this means for your bid
  • Price carries 30 of 100 points: a 10% discount moves about 3 points. The method statement decides this lot, not the discount.

Price arithmetic assumes straight proportional scoring; the tender pack may use another formula.

Procedure terms & legal framework

From the official record
Procedure method
Competitive flexible procedure
Legal basis
UKPGA · 2023/54 Procurement Act 2023
Procurement category
Services
Notice status
Administrative change
Procurement threshold
Above threshold (FTS publication)
Regulatory regime
Standard
Commercial structure
Stand-alone contract (no framework)
Competition type
Competitive procedure
GPA / WTO covered
Unspecified in notice
Recurring procurement
Unspecified in notice
First published
22 Apr 2025, 13:42 BST
Last source update
7 Aug 2026, 16:13 BST
Award evaluation window
Submission end – 13 Mar 2026
Authority reference
prj_4553, itt_2242
FTS notice number
2025/S 000-029471
Latest notice
Contract change notice (UK10)
Classification (CPV)
Construction-related servicesEngineering servicesSafety consultancy servicesTechnical testing, analysis and consultancy services
Delivery area
UK
Official registry OCID
ocds-h6vhtk-0505a0 Find a Tender
How it runs

The Owner's Engineer (OE) will be procured using the Competitive Flexible Procedure outlined in the Procurement Act 2023 (the Act).

There will be two stages in the OE procurement. In the first stage, tenderers will need to respond to the Procurement Specific Questionnaire (PSQ), which will include conditions of participation. The PSQ will cover topics including, but not limited to, conflicts of interest, economic and financial standing and the tenderer's ability to provide the technical and programme capabilities listed later in this notice. The capabilities set out in the technical ability conditions of participation section below can be delivered in various ways, including (but not limited to) by a tenderer and its supply chain, a joint venture, a special purpose vehicle or a consortium. Please note that while GBN considers this list of capabilities to be comprehensive, it reserves the right to change them (and any other information provided in this notice) by the time of launching the OE procurement.

If the response submitted by a tenderer as part of the first stage of the procurement satisfies all the relevant conditions, the tenderer will be invited to submit a tender as part of the second stage of the procurement. GBN will then assess the tenderer's proposals against questions covering Technical, Commercial and Social Value criteria. Please note that GBN reserves the right to refine its award criteria during the procurement process.

All documentation can be found on Jaggaer. All communications regarding the procurement will be held via Jaggaer. All responses will be submitted via Jaggaer.

beisgroup.ukp.app.jaggaer.com ↗

How it was run

Official notice
Run through: Jaggaer · Who buys & how to bid on JAGGAER
Supplier login requiredElectronic submission allowedLanguage: EN
Access & registration note: Free; latest Chrome/Edge/Firefox only — corporate browsers fail
Submission deadline
9 Jul 2025, 17:00 BST
Clarification deadline
2 Jul 2025, 17:00 BST
Submission channel
Official e-sourcing portal
Electronic submission
Allowed
Accepted languages
en
Detailed submission instructions & authority contactsFrom official release

beisgroup.ukp.app.jaggaer.com ↗

The JAGGAER eSourcing Portal may be accessed at beisgroup.ukp.app.jaggaer.com ↗

This is where submissions will be made, all communications between GBN and Tenderers will occur, and is where all official PSQ documentation will be issued.

For further assistance with regards registering on the Jaggaer eSourcing Portal, please consult the available help.

Phone: 08000 698 632

Email: [email protected]

Timeline

22 Apr 2025 → 7 Aug 2026 · 10 dates
  1. Planning notice published
    22 Apr 2025, 13:42 BST
  2. Next notice expected
    2 Jun 2025, 23:59 BST
  3. Tender notice published
    3 Jun 2025, 12:37 BST
  4. Clarification questions by
    2 Jul 2025, 17:00 BST
  5. Submission deadline
    9 Jul 2025, 17:00 BST
  6. Assessment summaries sent255 days ago
    9 Feb 2026
  7. Standstill ends245 days ago
    18 Feb 2026, 23:59 GMT
  8. Award decision expected by222 days ago
    13 Mar 2026, 23:59 GMT
  9. Contract starts210 days ago
    26 Mar 2026
  10. Latest notice published76 days ago
    7 Aug 2026, 16:13 BST

Notice history

21 events · 12 releases on Find a Tender · since 22 Apr 2025
  1. Preliminary market engagement notice published
    22 Apr 2025, 13:42 BST
    UK2
  2. Planned procurement notice published
    22 Apr 2025, 15:26 BST
    UK3
  3. Procurement method changed
    22 Apr 2025, 15:26 BST
  4. Deadline published: 19 Sept 2025, 23:59 BST
    22 Apr 2025, 15:26 BST
  5. Planned procurement notice published
    28 Apr 2025, 11:25 BST
    UK3
  6. Deadline moved to 19 Sept 2025, 23:59 BST
    28 Apr 2025, 11:25 BST
    +0 days · was 19 Sept 2025, 23:59 BST
  7. Planned procurement notice published
    30 Apr 2025, 09:29 BST
    UK3
  8. Pipeline notice published
    12 May 2025, 14:11 BST
    UK1
  9. Tender notice published
    3 Jun 2025, 12:37 BST
    UK4
  10. Status changed to active
    3 Jun 2025, 12:37 BST
  11. Deadline moved to 9 Jul 2025, 17:00 BST
    3 Jun 2025, 12:37 BST
    -72 days · was 19 Sept 2025, 23:59 BST
  12. Tender notice published
    4 Jun 2025, 17:06 BST
    UK4
  13. Tender notice published
    17 Jun 2025, 09:18 BST
    UK4
  14. Tender notice published
    2 Jul 2025, 10:11 BST
    UK4
  15. Contract award notice published
    9 Feb 2026, 14:27 GMT
    UK6
  16. Status changed to complete
    9 Feb 2026, 14:27 GMT
  17. Procurement method changed
    9 Feb 2026, 14:27 GMT
  18. Contract signature expected
    6 Mar 2026, 23:59 GMT
    scheduled
  19. Contract details notice published
    30 Apr 2026, 13:49 BST
    UK7
  20. Contract details notice published
    29 Jun 2026, 17:20 BST
    UK7
  21. Contract change notice published
    7 Aug 2026, 16:13 BST
    UK10
Published amendments (5)

Added Operations as a technical capability in the conditions of participation.

Attaching the early market engagement pack shared with selected suppliers to the notice.

Updated Draft contract. The previous contract attached to this notice included an outdated interim statement of requirements which has now been updated in Schedule 4 to reflect the current interim statement of requirements previously uploaded to this notice.

Updating documentation in line with that provided on Jaggaer eprocurement system.

Dear Suppliers, Please see in the attachments section version 2 of the PSQ Instructions and Form documents amended, which contain the following updates: · The GBE-N name change · Only one OE Contract is intended to be awarded · Only one TP Contract has been awarded · Minor amendments to the conflicts of interest definition · Minor amendment to the prompt payment question in the PSQ form · So…

Routine re-releases (12)
  • 2025-07: 1 release · 2 Jul 2025
  • 2025-06: 3 releases · 3 Jun 2025, 17 Jun 2025
  • 2025-05: 1 release · 12 May 2025
  • 2025-04: 4 releases · 22 Apr 2025, 30 Apr 2025

Commercial outcome & contract awards

Published awards, contracts and bid statistics, not a forecast
Awards 2
Awarded value £300,000,0001 award exc. VAT · 1 repeated publication of the same award counted once
Bids received 61 from SMEs
Named bidders 6published on the award notice
Contracts signed 2latest 31 Mar 2026
Awarded toValueDateStatus
Amentum Clean Energy LtdVCSE, Cavendish Nuclear Limitedjoint award6 Mar 2026 – 6 Mar 2040 · up to 3 Sept 2041Extensions: The duration of the Owner's Engineer contract will be linked to the Completion Date of the Technology Partner contract. Therefore, the extension provision is not linked to a specific date. The intention is that the OE will support the Client to completion of the first fuel cycle.£300,000,0009 Feb 2026Awarded
Amentum Clean Energy LtdVCSE, Cavendish Nuclear Limitedjoint award£300,000,000 †same award published again · counted once—Awarded

Contracts

  • Owner's Engineer · Amentum Clean Energy LtdVCSE, Cavendish Nuclear Limited

    Signed
    31 Mar 2026
    Value
    £300,000,000
    Period
    23 Apr 2026 – 24 Apr 2040 · up to 21 Oct 2041 with extensions
    Status
    active
    Extensions
    The duration of the Owner's Engineer contract will be linked to the Completion Date of the Technology Partner contract. Therefore, the extension provision is not linked to a specific date. The intention is that the OE will support the Client to completion of the first fuel cycle.
    3 agreed KPIs: Social Value · Deliverable Quality · Availability of Core Team
    • Social Value, The three sub-KPIs below are wrapped up into this overarching Social Value KPI. SV1 (Female Apprenticeships): Achievement of the cumulative target for Female Apprenticeships Created for UK beneficiaries as a direct result of the contract. SV2 (T-Level Placements & Internships): Achievement of the cumulative target for T-Level Placements Created for UK beneficiaries as a direct result of the contract. Achievement of the cumulative target for Internships Created for UK beneficiaries as a direct result of the contract. SV3 (Work Progression Upskilling): Achievement of the cumulative target for no. of staff in work progression upskilling delivered through training opportunities and comprehensive upskilling programmes.
    • Deliverable Quality, % of deliverables received by the submission deadline and accepted by the Client (accepted with no significant changes) against the total deliverables with submission deadlines within Measurement Period.
    • Availability of Core Team, Availability of Core Team staff (Actual FTE / Baseline FTE).

  • Contract 2 · Amentum Clean Energy LtdVCSE, Cavendish Nuclear Limited

    Signed
    31 Mar 2026
    Value
    £300,000,000
    Period
    31 Mar 2026 – 24 Apr 2040 · up to 21 Oct 2041 with extensions
    Status
    active
    Extensions
    The duration of the Owner's Engineer contract will be linked to the Completion Date of the Technology Partner contract. Therefore, the extension provision is not linked to a specific date. The intention is that the OE will support the Client to completion of the first fuel cycle.
    • Change 31 Mar 2026 This notice does not describe a modification of the contract. Instead this notice is being used as an addendum to contract detail notice. This notice has a copy of the redacted contract included, which is a requirement of the Procurement Act. Find a Tender service currently doesn't have the functionality to edit the notices to attach the contract to the UK7 that this notice is linked to.
    3 agreed KPIs: Social Value · Deliverable Quality · Availability of Core Team
    • Social Value, The three sub-KPIs below are wrapped up into this overarching Social Value KPI. SV1 (Female Apprenticeships): Achievement of the cumulative target for Female Apprenticeships Created for UK beneficiaries as a direct result of the contract. SV2 (T-Level Placements & Internships): Achievement of the cumulative target for T-Level Placements Created for UK beneficiaries as a direct result of the contract. Achievement of the cumulative target for Internships Created for UK beneficiaries as a direct result of the contract. SV3 (Work Progression Upskilling): Achievement of the cumulative target for no. of staff in work progression upskilling delivered through training opportunities and comprehensive upskilling programmes.
    • Deliverable Quality, % of deliverables received by the submission deadline and accepted by the Client (accepted with no significant changes) against the total deliverables with submission deadlines within Measurement Period.
    • Availability of Core Team, Availability of Core Team staff (Actual FTE / Baseline FTE).

Bid statistics published by the authority

BidsSMEVCSEValid bid range
6final-stage tenders11—

Who bid

Bidders as named on the Procurement Act 2023 award notice. “Won” means the bidder holds an award on this notice.

Contracting authority & participating public bodies

GREAT BRITISH ENERGY - NUCLEAR

Contracting authorityPublic authority - central government GB-COH: 05027024 · GB-PPON: PRCJ-2655-YDML Department For Energy Security and Net Zero, London, London, SW1A 2EGContact email

Bidders & participating suppliers

7 commercial parties on the notice · 2 awarded
  • AFRY SOLUTIONS UK LIMITEDBidder / tendererGB-COH: 01192469GB-PPON: PLDG-4388-CJYH 920 Birchwood Boulevard, Warrington, North West, WA3 7QS
  • AMENTUM CLEAN ENERGY LIMITEDAwarded supplierGB-COH: 01120437GB-PPON: PBDC-7744-BTPG 305 Bridgewater Place, Warrington, North West, WA3 6XFContact email
  • CAVENDISH NUCLEAR LIMITEDAwarded supplierGB-COH: 03975999GB-PPON: PJRC-9195-NWZW 33 Wigmore Street, London, London, W1U 1QXContact email
  • LLOYD'S REGISTER EMEABidder / tendererGB-COH: IP29592RGB-PPON: PGQQ-3498-WYBD 71 Fenchurch Street, London, London, EC3M 4BS
  • MOTT MACDONALD LIMITEDBidder / tendererGB-COH: 01243967GB-PPON: PMRR-1398-DNDL 10 Fleet Place, London, London, EC4M 7RB
  • OVE ARUP & PARTNERS LIMITEDBidder / tendererGB-COH: 01312453GB-PPON: PZJN-8211-DBBV 8 Fitzroy Street, London, London, W1T 4BJ
  • TRACTEBEL ENGINEERING (FRANCE)Bidder / tendererGB-COH: FC036592GB-PPON: PVRT-8584-BDPY 7 Rue Emmy Noether, Saint Ouen, FR, 93400, FR

Official documents & specifications (35)

Official links; attachments are not copied

Tender pack and attachments

Show 8 more documents

Notices published for this procedure

  • Contract change notice contractContract change noticeUK10Contract change notice on Find a Tender
  • Contract details notice contractContract details noticeUK7Contract details notice on Find a Tender
  • Contract details notice contractContract details noticeUK7Contract details notice on Find a Tender
  • Contract award notice awardContract award noticeUK6Contract award notice on Find a Tender
  • Tender notice tenderTender noticeUK4Tender notice on Find a Tender
  • Tender notice tenderTender noticeUK4Tender notice on Find a Tender
  • Tender notice tenderTender noticeUK4Tender notice on Find a Tender
  • Tender notice tenderTender noticeUK4Tender notice on Find a Tender
Show 5 more notices

6 further documents are listed in the JSON mirror.