StevieTerrier
Sorry, I don't know Heliflight. Perhaps you meant MultiFlight at Leeds/Bradford? I've heard they are good - Mark Griffiths is an extremely good instructor. He taught me, and moved there when the school where I trained closed down. I don't know if he still instructs, or if they've 'trashed' any helicopters. Not sure that's such a good 'measure' of a school - surely the chances of an incident increase with the number of helicopters/students?
I'm only a PPL giving an opinion for what it's worth. There are others far better qualified than me to advise.