asked the Secretary of State for Defence what progress has been made in establishing a common system of electronic identification (FFS) for aircraft of 4 and 2ATF.

As my right hon. Friend indicated in an earlier reply to the hon. Member on 23rd January—[Vol. 884. c. 463.]—NATO is actively pursuing agreed concepts for future identification equipments. In the meantime procedures have been devised and implemented to allow different systems to operate side by side.