Have you had a look at welshpool or Highland in Inverness?
Both on the par with US prices and the beer will be better in the UK.
And if you do over run it's not such a pain to get back for a long weekend to complete.
It is more than possible to do a 3 week ppl in the UK my record with someone who had all the exams done before he started was 2 weeks start to finish. He wasn't some hot shot kid either. Just always booked first lesson of the day and one after lunch about 2. Then picked the last lesson up at 6 if available and he, or me wasn't tired (or his brother wanted to go to the pub). Solo in three days. Made all the difference having the exams out of the way.