Jonny - I'm from Rugeley, so just up the road from you.
What modifications do you have? If you've replaced your dead engine and turbo with standard items, there's not much point in going for a rolling road setup
However, if you're modded, its definitely worth considering
The ONLY place I would go is PowerStation in Tewkesbury - I know its not exactly on the doorstep of Lichfield, but they are professional and knowledgable
If you REALLY want it set up well, give Leighton a call from FC Performance - he maps my car and is closing on 400bhp, so he knows what he's doing (his own Coupe is well above this!)