Question to the Ministry of Defence:

To ask the Secretary of State for Defence, what progress has he made in updating the UK F-35B fleet with Block 4 modifications.

We do not routinely comment on detailed delivery schedules. However, the Block 4 upgrade programme continues, it did not impact the declaration of Lightning Full Operating Capability. The Block 4 upgrade programme will further develop our world leading Combat Air capability, the UK Lightning, through improvements in lethality, survivability and supportability.