Cambelt price match....

In my experience, although the Surrey/South London dealers will do the £399 offer if you ask them, they don't want to do it even at that price, and they will point out that it is not for the "full cambelt service kit". They want £600 plus to do the job round here and asking about pricematching will get you a 10% discount. I couldn't find any audi garage in this neck of the woods to do a cambelt/aux/water pump as recommended for less than the £399 price, even independent VW specialists round here ask more than £400. I used 4 Rings Ltd earlier this year and I couldn't recommend them highly enough, they are excellent and all ex VAG techs & use VAG parts only. And they come to you if needed, which is a bonus.
If you really want the VAG stamp, you could book it into the Volkswagen branch as their value servicing prices for a cam belt change are cheaper, for sometimes the same workshop, go figure?