Welcome to the forum Alan, you'll find the members on here are a friendly and helpful bunch :)
My advice would be to ring around all your local Audi dealers to see which one is the cheapest. Different franchises do different offers on servicing, brake replacement and cambelt/water pump changes etc.
In failing that, you can take it to any garage as long as it VAT registered and they use genuine Audi parts. The invoices will prove it has been serviced if that makes sense and Audi cannot refuse this as long as the two mentioned criteria are met.
Hope I've helped
Cheers
Steve