Perhaps you're thinking of 234 Sqn?
63 and 151 were at Chivenor, 234 and 79 at Brawdy. Then all manner of change came with the cuts of the 1990s
The TWUs disappeared and the lunacy of Valley based Hawks flying all the way to Pembrey range detachments at St Athan started.
Pembrey was only about 5 mins form wheels up at Chiv, not much further on a Caldey Gap departure from Brawdy.....