I'm doing my flight training 1hr north of Toronto at Lake Simcoe Regional Airport. I fly Piper Cherokee 140's and 180's and Cessna 172's. I pay CAD$90/hr (£40GBP) for the plane and CAD$40/hr for the instructor. There isn't much flying from January to March but the rest of the year is great. I can't help you in your decision because I haven't trained in Florida but the exchange rate in Canada is pretty good and seems to be getting better and better for visitors.
I know a few Brits that have come to Canada for flight training and they seem to be happy.
I think you'll only end up more confused after reading all of the replies in this forum. Good luck with your decision.