As Julian mentioned, Landing fees can increase the cost in the UK (a friend converted his FAA IR to JAA IR and the landing fees / approach fees added an additional £500 to the cost, and this was for just over 15 hours flying).
I'd say, that it doesn't matter where you learn, but the fact is that when everything is taken into account - airfares, hotel, visa issue fees etc.... it is still far cheaper in the USA, especially with the good exchange rate at the moment. I paid $5000 for 64 hours in a 172 in the USA for a JAA PPL - back in 2000 though, plus about $1000 hotel and £250 airfare. I still ate in the USA,and had a damn good holiday at the same time, and the hotel rate is still the same now as it was then at $43 per night (special discounted hotel rate for flight school people)
