I have always used Duncans in Byfleet for all my VW's. They have excellent VW/Audi experience and are incredibly honest.
However, I had my last service done by Storm Developments in Aldermaston, as they were doing cam follower, DV change and remap all in the same day to minimise time off work. They did a brilliant job whilst I looked around their showroom browsing supercharged Audi R8's, modified 997 Turbo's, a 700bhp S3, Golf G60's, R32 Turbos etc etc...