ptpt - are you the guy I spotted in Halstead?
I started using Hyperion last year, car is going in next month for service (and maybe a flat floor set up) but be warned, they are very busy at the moment with race car preps.
That said, over the last year they have been pushing the 'road' customer services and are offering more services to non race customers. They had an open day last spring for this very purpose and was suitably impressed by what they can offer.
Really nice bunch of people, very knowledgeable and I know my car is in safe hands.
If you mention you are a club member you may be able to get some discount too.
Must stress that although I am local to them I have no connection with them - just want to pass on the good word.
Dave