OPS Autos, which I bought my car from were great. They are a one man band (trader, rather than a dealer) run by a chap called Sandy. Top service. He was very honest throughout, and the car was exactly how he described it over the phone to me.
After money had changed hands he was still helpful, and even offered to pick me up and drop me off home if I broke down (I didn't). He was a proper enthusiast and I would buy from again
Here's his site. Comes recommended.
http://www.opsautos.com/