Audi service garage rec. please. UK (East Anglia)

I've got a 7 year old A4 2.8 (V6 30V). I'm looking for a competent garage to perform an 80k mile service (includes cam belt change). Any recommendations, preferably in East Anglia?
I used to use our local franchised dealer. Not were they expensive but I caught them charging for things they hadn't done and they failed to complete even basic tasks (eg oil change) competently. I moved to a non-franchised Audi specialist (where you actually get to talk to the man with greasy hands), but they have been sold and no longer specialse in Audi.
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Try these http://www.audi-specialists.co.uk I have only recently started to use them , but first impressions are excellent!! They will provide a car to use while they service yours.
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