CPL/IR
I would be really interested in your findings as i will hopefully be in the same boat/plane as you in a few months time (exams permitting!)
I would recommend Craig Padfield at Ravenair Liverpool he seems to be a terrific instructor.
One question i would ask a school is how many students they have going through the school in an average week- there are some schools who are so busy with PPL students that others tend to get left out and flight training gets interrupted while you wait for your instructor to have time to squeeze you in.
Good luck with your research.
I look forward to reading about what you find out.