'Unit20' on the Wirral between Chester-Liverpool, I'm taking my S3 there in a couple of weeks for its second service/inspection. Audi wanted between £365-£439 depending on which dealer I took it to. Unit20 are doing it for £220!!! All genuine Audi parts are used, they also use the Audi online software to show the service has been done. On top of that they also give you a genuine Audi paper service book with their stamp in it, so you can sell it to a private buyer and show them the cars history.
I have looked at reviews and guys come from all over the country to use them as they have a good reputation! This is off one guy that commented on Facebook:
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When I called in to take a look and book the service in they had a lot of top end Audi's in there getting work done!