Thx all for your replies so far. That warnings about cabair makes me concern a little but I've read a lot about it around here and I've found very good feedbacks, anyhow I think I'll give a look at the school myself when I'll travel to GTW for my medical revalidation.
To budget my hour building in the UK and to assess if it's worth can someone tell me what normal hiring rates are? C150 or any other cheap VFR aircraft. That AT-3 looks interesting, what about that one?
Are airport fees expensive if flying out from bournemouth? I know tht HR building is cheaper in the US but I will stay for 7 month during GS so I though to take some 20-30 hours?!? Maybe more depending on rates.