That's quite nicely central!
Depending whether you are north or south Shropshire you have the choice of MRC in Banbury or I have used More-BHP in Crewe with 3 past and present vehicles.
Both MRC and More-bhp have 4WD rolling roads and will give before and after figures.
MRC are more expensive, but they are more specialized to Audi products. MRC also appear to get the best gains as they are a tuning company, whereas More-BHP are just remaps with a workshop to fit parts or do DPF deletes etc
I have been happy with my maps from there, although I am thinking of seeing if I can get the map tweaked on my S5 as unfortunately I had intake overheat due to an incompetent technician working on my car for a recall, so the engine wasn't in ideal condition and also flagged supercharger coolant pump running dry which was part of the issue, so the mapper couldn't fine tune the boost as the intake temps kept knocking it back. Still goes like stink though, just feel there maybe the possibility of a bit more to get out of it.