The states isn't the bargain it once was. By the time you've paid for flights, had a trip to London to get a visa, had your ringpiece inspected by TSA several times and done your PPL at one of the JAA establishments in Flo-Rida (who have extremely mixed reviews), there probably isn't much in it.
Avoid the JAA places and there is a lot of difference. Even taking into account flights and hotel, you can shave £3-4000 off the price of a PPL.