Re an Alarm 'replacement' these links give some info...
http://http://www.thinkdefence.co.uk...er-late-never/
http://http://ukarmedforcescommentar...n-hostile.html
Presumably something along these lines will be made available for Fleet Air Arm and RAF F35B's.
Remember, when talking about UK Defence cuts, that some of this is/was temporary, due to financial mess ups within UK MOD going back ten years or more. The 2015 Defence review actually was actually fairly good from the armed forces point of view. For example, UK 'gapped' long range maritime patrol aircraft, but have recently annouced the purchase of Boeing P8 Poseidon aircraft