As others have said, ravenair and JD aviation are the 2 CPL/ir schools in the North west. I did a cpl with JD last year and found that although a small outfit, they are very thorough and were good value. Mr JD is a SATCO and ex ravenair aoc pilot, there is a wealth of experience to learn from. I know plenty of people who have trained at ravenair for cpl/ir and were very happy also.
Main drawback I saw at Ravenair is that initial parts of cpl and IR are done on a Tomahawk, which I think is of limited value in getting you used to a more complex aircraft that you sit the test in. I understand they are getting a new fnptII sim shortly so that should help a good deal.
The main things I looked for in a cpl ir school were financial stability, aircraft availability, speed and continuity of training and gut feeling on meeting instructors and the setup in general.