BA cream off low hour guys from Oxford, and in some cases Cabair, FTE & CTC. It's like an old boys club!
Virgin won't make you pay for TR, but other than them and BA you will end up paying somehow, if it's a salary reduction while decreasing term bond, or salary reduction each month to cover training.
I only have anecdotal evidence as to which ones do what, it's not robust so if you want it PM me or post here and i'll put it up.
Horgy