There's a guy at Bournemouth who will do all the ground school and exams over a weekend...can't remember his name but I know a few PPruner's have used him before. Costs about 300 quid.
Why not do the exams in the US? If you are well prepared [ie. read the TT books several times] and the school is reputable, then there is no problem taking the CAA exams in the US. You can bang them out the first week...
Cheers
EA