System operational · UK tenders
Awarded
ocds-h6vhtk-0505a0 · contractAmendment

Owner's Engineer

GREAT BRITISH ENERGY - NUCLEAR

Estimated Value

Up to £300,000,000

Deadline

9 July 2025

Published

7 August 2026

Type

Not specified

LondonGBselective

Overview

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.

Additional details

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.

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Award Details

AMENTUM CLEAN ENERGY LIMITED

9 Feb 20266 Mar 2026 – 6 Mar 2040

£300,000,000

CAVENDISH NUCLEAR LIMITED

£300,000,000

Likely incumbents

Suppliers who won similar work from this buyer in the last 5 years.

5 found
  1. 1

    Deloitte LLP

    2 contracts wonlatest 9 Apr 2026CH 303675

    £8m

    total awarded

  2. 2

    COGENT SKILLS SERVICES LTD

    1 contract wonlatest 28 Aug 2025ends 15 May 2029CH 07806185

    £480,260

    total awarded

  3. 3

    One Two Agency Ltd

    1 contract wonlatest 4 Jun 2025CH 02257022

    £60,000

    total awarded

  4. 4

    Decision Analysis Service Limited

    1 contract wonlatest 9 May 2025CH 05980241

    £98,820

    total awarded

  5. 5

    Heales Health Services

    1 contract wonlatest 1 May 2025CH 05521879

    £300,000

    total awarded

Deloitte LLP is the most likely incumbent based on recency and category match. To win, bidders typically need a clearly differentiated proposition or a price advantage.

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SponsoredEst. 2010
Gladstone & Co AccountantsTax advisers · East Ham, London

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Buyer Profile

GREAT BRITISH NUCLEAR
Typepublic body
RegionUKI32
Total tenders14
Total spend£611,240,880
View buyer profile

Key Dates

Published

7 August 2026

Submission deadline

9 July 2025

Notice type

contractAmendment

Source

find a tender

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