Question to the Ministry of Defence:

To ask the Secretary of State for Defence, with reference to Box 12 page 105 of the Strategic Defence Review 2025, what is the composition of the Atlantic Bastion Type 26 anti-submarine warfare frigate force.

Atlantic Bastion is a portfolio of programmes to secure the North Atlantic for the UK and in support of NATO against a range of underwater threats. It will develop a range of capabilities that enhance existing systems and deploy new platforms into the North Atlantic. It is separate from Baltic Sentry, which is a NATO led activity in the Baltic Sea to strengthen the protection of critical infrastructure. The Royal Navy will be able to learn from Baltic Sentry and be able to share lessons from Bastion programmes with NATO allies.

Through AUKUS Pillar 2, the nations are working together on an algorithm to support Maritime Patrol Aircraft processing systems. This work will inform future capability development of Bastion systems powered by AI to enhance acoustic detection.

Capability options under Atlantic Bastion are submitted for consideration in the Defence Investment Plan. Options for capabilities that would be deployable from the Type 26 Frigate Force are included in these options.