RedHot - there are dozens and dozens of students that come across to "complete" their training....unable or unwilling, for whatever reason, to complete in the UK. It happens every day.
Although I am HEAVILY involved in the short, sharp shock courses (21/28 day PPL) I have to admit that I am not a lover of them.
I do see a distinct difference if people have done some flying in the UK before coming over (and I'm doing myself out of work by saying that - but it's true).
Another MAJOR plus would be to get all written examinations and possibly R/T practical out of the way before crossing the Atlantic. You wouldn't believe how much easier it will make your course.
Again, I meet many students who have not done anything before coming out here - and it HURTS them.