Brakedwell,
The JP wasn't used for advanced flying training, it replaced the Provost T1 in the basic phase and when the Chipmunk was phased out and the RAF went over (briefly, twice!) to all through jet training it effectively replaced the Chipmunk. The Vampire T11 replacement was the Gnat T1 and eventually the Hunter F6/T7 for beanpoles and when they ran out of Gnats.
Hairyclameater,
Aircrew in the loosest possible way................................
