Doing an intensive course in the UK should get you your PPL in five/six weeks allowing for weather. You'll be able to fit the groundschool and R/T practical in during this time if you're organised about it.
If you can do the groundschool beforehand, even just doing the studying bit from books, then take your exams when you start the course, you'll have a big headstart. If you're on a mission to finish the PPL you can't afford to get behind on the groundschool. Try to get the R/T training done as close to the start of the course as possible.
I'd did 38 hours for my PPL in five weeks during the summer of '82 on an intensive course in the UK (when the PPL course was just 35 hours!)
As to a school, I can't really make any recommendations. I've only recent experience of two schools - one I would not recommend for an intensive course, and I'm not sure if the other really goes in for that sort of thing.
So, make sure that the school:
a) is totally happy about doing an intensive course (reject any school that raises ANY objection whatsoever)
b) is willing to give you equal priority with existing students at weekend. Don't be pushed to the back of the queue for slots on Sat/Sun just because "you can catch up the time during the week".
c) can do the R/T practical test in house.
Best wishes and have a great summer.