Was it the trainer for fiture heavy bombers pilots (Vulcan, Victor, Valiant, Canberra...) or were they selected from the fast jet pipeline?
By the mid 60s, when I went through the system, streaming from BFTS was done as follows:
Fast jet (Lightning, Hunter and occasional Canberra) to AFTS at Valley primarily on the Gnat or the Hunter if you couldn't fit into a Gnat.
Heavies (V force, Maritime & Transport/AAR) to Oakington on the Varsity
Rotary to Shawbury on the Whirlwind? - not sure after so many years!
At the end of the 60s Fast Jet also included Harrier, Buccaneer and Jaguar.