I have used Well Lane a few times with my RS Turbo. If you get Barry (I used to specifically request him) there not too bad and they did set my car up fairly well, I never had any real problems.
BUT I now use Karl Norris and he pointed out lots of things which Well Lane missed and I would say Karl is 3 times as good!!!!
Personally I wouldn't take my car back cos I've found someone better
What about Jamsport? They seem to have a very good reputation and are fairly close to you (Northhampton)
hope this helps