Gary
I always used Gary May and like you will be looking for a new place to have my car set up. I think that if you are going to use it to Race or are a serious track day driver then Andy Jupp at PGM sounds like a good bet. I spoke to him at The Plough and he sounds like he has a very good pedigree with Caterham and some race teams, he also seems like a very nice chap. I can thoroughly recommend Richard as well, and I believe he has all the equipment to set up the car as well, would be interested on how you get on with whoever you choose.
Nick