Englishal is completely right. The only problem with training in the US is that it spoils you as to how GA flying should be.
The landing fees, general pettiness, golf club mentality and of course the much higher cost of flying in the UK, soon test your determination to keep flying.
Mind you the £1,000s of pounds you saved on your PPL may keep you in smug grins for a while.
To add one thing, your PPL can be done in 3 weeks (weather permitting) if you're prepared to work very hard. A lot of people suggest doing the exams before you go, and while this will help, it will also significantly add to the overall cost. And for most people, that's the main reason for training in the States.