Being the owner of the website linked to in A and C's post above, I can safely say that it CAN be done quickly and cheaply in the UK.
I flew a C-152 that looked like new for £78 an hour, and as has been mentioned above, If you live close to the south coast you can knock another £15 an hour of that if you chose to fill up with duty free fuel and head off to France every day.
The lease I had, I only paid for flying time, so that means any taxiing was in my logbook but at no extra cost.
I also managed 80 hours in 5 weeks in April / May up here in Scotland (without using my IMC rating).
I still reckon it would not have been any cheaper for me to do it in the USA and the real bonus is that my CPL instructor agrees that my hour building here in various winds and weathers has really helped my flying and is making the CPL course much easier for me. have a look at
Home Page - BRK where I leased my 152 from, they offer a great friendly service.
Regards D-G