BRIMSTONE 3

Rating: Compared to financial year 24/25 Q4, the NISTA/SRO Delivery Confidence Assessment (DCA) rating at 25/26 Q4 remained at Amber. This is primarily due to the following factors. 1. While awaiting formal endorsement of the revised programme baseline, it continues to manage resourcing constraints and finalisation of the operational safety case. 2. Key progress has been made, including continued stability of the schedule, safety case advancement and programme maturity.

Schedule: Compared to financial year 24/25-Q4, the programme's end-date at 25/26-Q4 remained the same at 31/12/2028.

Cost: Exempt under Section 43 - Commercial interests

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

Rating: Compared to financial year 23/24-Q4, the Delivery Confidence Assessment rating at 24/25-Q4 remained at AMBER. This is primarily due to the following factors. This is primarily due to delays in agreeing the revised baseline, continued resourcing constraints, and the need to finalise the operational safety case. While key progress has been made, including stabilisation of the delivery schedule and safety case advancement, risks remain around programme maturity and delivery confidence.

Schedule: Compared to financial year 23/24-Q4, the project's end-date at 24/25-Q4 remained at 31/12/2028. This is primarily due to the following factors. Compared to the financial year 23/24-Q4, the programme's end date in 24/25-Q4 remains scheduled to finish on 31-12-2028.

Cost: Section 43 - Commercial interests

Source: NISTA Annual Report 2024-25 (data)

Rating: Compared to financial year 22/23-Q4, the Senior Responsible Owner's Delivery Confidence Assessment rating at 23/24-Q4 increased from Red to Amber. This is primarily due to the following factors. The Delivery Confidence Assessment of AMBER was endorsed by an IPA Review in February 2024. There are still concerns in relation to people capability and capacity, programme management information and partnering culture which are negatively impacting the programme. There are challenges with resourcing sufficient suitably qualified and experienced people across the programme and delivery teams, and within industry. Programme Governance and the availability of Management Information is also being refreshed alongside a plan to improve Programme performance. Opportunities to spiral capability developments to ensure capability is delivered at the earliest opportunity are being considered by the SRO.

Schedule: Compared to financial year 22/23-Q4, the project's end-date at 23/24-Q4 has decreased from 2029-12-30 to 2028-12-31. This is primarily due to the following factors. The previous date provided was the OSD (Out of Service Date). The programme is also undergoing a rebaselining activity which may alter the end date again.

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

Source: IPA Annual Report 2023-24 (data)