More people need to look at Arizona... A Flight School I know and love, and always harp on about on here now have a Cherokee 140 (news to me, but I'm going out there later this month so will check it out for myself) which is $85/hour. That's less than £60 at current exchange rates. Their C172/PA-28s are around $100/hour, still a massive saving over the UK.
I'm all for promoting GA in the UK, and work at a school in the North of England where we have a very reasonably priced C150 (£100/hr) and C172 (£130/hour) with none of the membership fees and landing/approach fees normally associated with operating here.
It's sickening to think, that for 50 hours in our C150, you could do 50 hours in the States in the Cherokee, and have £2000 left over to cover your return flights, car hire, accommodation and food etc...