Question to the Ministry of Defence:

To ask the Secretary of State for Defence, with reference to page 45 of his Department's Defence Investment Plan, published 30 June 2026, what sovereign world-leading propulsion system will the Collaborate Combat Aircraft use.

Collaborate Combat Aircraft (CCA) are developmental. UK Defence will leverage years of work in advanced propulsion technologies. The RAF and Rolls-Royce joint investment in the Orpheus engine family is one example. This work will help to mature capabilities and inform future decisions.