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Transparency · Major projects

TYPE 31

MOD · MOD_0112_1718-Q1 · Earlier name: Type 31e (March 2024)

Department page: Ministry of Defence

Data as atRatingEnd dateWhole-life cost
March 2024Amber (the department's own assessment)31 May 2030Exempt under Section 43 of the Freedom of Information Act 2000 (Exempt under Section 43 of the Freedom of Information Act 2000 (Commercial Interests) - Commercial interests.)
March 2025Red (NISTA's independent assessment)Low: 31/05/2030, Mid: 31/05/2030, High: 31/05/2030Section 43 - Commercial interests
March 2026Red (NISTA's independent assessment)31 July 2033Exempt under Section 43 - Commercial interests

Each year’s cost is shown with its price basis. Costs are not compared between years: the March 2024 and March 2025 reports state no price basis, and from March 2026 costs are in 2024/25 prices.

The department’s commentary

This is the department’s own commentary. It may use different prices from the table above, so its figures may not match.

March 2026

Rating: Compared to financial year 24/25 Q4, the NISTA/SRO Delivery Confidence Assessment (DCA) rating at 25/26 Q4 remained at Red. This is primarily due to the following factors‚ 1. Successful delivery to meet the User Requirements remains on track, but the impact of inflation will require a reset of the programme’s Approved Budgetary Limit following announcement of the Defence Investment Plan. 2. Challenges also remain in the first of class schedule against an ambitious build timeline, and the complex integration challenges.

Schedule: Compared to financial year 24/25-Q4, the programme end-date at 25/26-Q4 remained the same at 31/05/2030.

Cost: Exempt under Section 43 - Commercial interests

Source: NISTA Major Projects Annual Report 2025-26 (data)

March 2025

Rating: The Infrastructure Project Authority's Delivery Confidence Assessment rating at 24/25-Q4 is RED, compared with the project's assessment last year of AMBER. This is due to the following factors. Successful delivery to meet the user requirements remains on track, but the impact of inflation will require a reset of the programme’s Approved Budgetary Limit. Challenges also remain in the first of class schedule against an ambitious build timeline, developing a new combat system for the Royal Navy and the complex integration challenge.

Schedule: Compared to financial year 23/24-Q4, the project's end-date at 24/25-Q4 remained at 31/05/2030. .

Cost: Section 43 - Commercial interests

Source: NISTA Annual Report 2024-25 (data)

March 2024

Rating: Compared to financial year 22/23-Q4, the Senior Responsible Owner's Delivery Confidence Assessment rating at 23/24-Q4 remain at Amber. This is primarily due to the following factors. Successful delivery appears feasible but significant issues remain, requiring sustained management attention and mitigation. A commercial dispute with the Shipbuilder has been settled and the impact of inflation and a shortage of shipbuilding skills have been partially mitigated. Challenges also remain in proving the first of Class against an ambitious build timeline, a new combat system for the Royal Navy and the complex integration challenge.

Schedule: Compared to financial year 22/23-Q4 the project's end-date at 23/24-Q4 increased from 2029-03-31 to 2030-05-31. This is primarily due to the following factors. Pressure to the schedule following dispute settlement is being assessed through schedule risk analysis and identification of opportunities between the MOD and Contractor. Any identified impact to Approved Dates will be subject to GMPP governance processes with the appropriate Approval Authorities.

Cost: Exempt under Section 43 of the Freedom of Information Act 2000 (Exempt under Section 43 of the Freedom of Information Act 2000 (Commercial Interests) - Commercial interests.)

Source: IPA Annual Report 2023-24 (data)

Names, figures, dates, ratings and commentary are as the department reported them. Where a rating, cost or date is withheld, the file’s wording is shown. Every major project →