For BB-1. BO, 2 gunners. 6engine,3 repair,1 HH gunner (soft till lv120), 1 scout.
For Escort-1.BO.2 reload AA.1.sonar. others are unnecessary, however, you may consider train 1 restore, 1 repair ,1 engine for better performance purpose. ( highly recommand, since the UK escort is the best that I can recall from my battle experiences)
if you are aiming for a 11.7+armor QV, you need to train almost everything with delay.