Without any doubt recommend Dave Coulson at Cranfield Flying Club. Very experienced chap having been teaching the instructor rating for many many years and is one of the true characters of Cranfield. He has a very unique approach towards instructing and will turn anyone into a decent pilot. His approach can take a bit of getting used to but if you are prepared to give as much as he gives you, you'll get on fine with him.
Web site:
www.aviationtrainingschool.com
Good look with the rating where ever you do it.