All of these UK Military aircraft types can and do use ADS-B:
Jupiter
Juno
C17
Voyager
C130J
Merlin
A400M
Prefect
Texan
Phenom
Hunter (FRADU)
Sentry
F35B
Poseidon
Most of these also have ADS-B receive. Also, some other aircraft like the BBMF’s carry PowerFLARM that receives ADS-B. Other types have modification plans too - it’s becoming more and more widespread outside the UK so they need to get the capability.
Then there are USAF and other visiting forces that use it too.
