Written questions by Francois.

What is the estimated cost of the upgrade of submarine docking facilities at Devonport Dockyard; and when that work is due for completion.

The cost of the current endorsed programme for upgrading submarine docking facilities at Devonport Dockyard is approximately £3 billion. The opening of 9 Dock in September 2024 is the latest of a number of significant investments in Devonport. A range of other upgrade works will continue over the next five years. We are also examining what future further investments will be required to meet future demands.

When the (a) sixth and (b) seventh of the Astute Class submarines are due to enter operational service with the Royal Navy.

The planned in-service and out-of-service dates for Royal Navy submarines are withheld as disclosure would, or would be likely to, prejudice the capability, effectiveness or security of the Armed Forces. Five of seven Astute Class submarines have been delivered to the Royal Navy, with boat six, HMS AGAMEMNON, launching from the BAE Systems Shipyard on 3 October 2024. The final Astute Class submarine is at an advanced stage of build.