The list of airlines that recruit from FTE is quite a long one, but from that list there are but a few who run mentorship schemes through FTE:
Flybe
City Flyer
ThompsonFly
CityJet
(I may have missed some here)
I've been through the Flybe selection to Phase 4, and unfortunately fell down on the interview (they required a lot more knowledge of the kind of lives pilots lead and about the aircraft than CityFlyer or NetJets did). I'm afraid ThompsonFly and CityJet are unknown quantities to me selectio-wise.
I'd say you'd do best with Flybe (providing you like the aircraft + airline), the selection is almost question-for-question the same as CityFlyer's, until you get to P4.
Best of Luck!