been quoted £78 +vat to change t/belt and tensioner by vw specialist in burton, i will supply belt which i thought was pretty reasonable
make sure you buy a VAG timing belt, dont be skimping on something as important as a timing belt
Also get a genuine VW tensioner, I've used a GSF one before and the Tensioning tool I have didn't even fit it.
the only downside is that they cost about £50 for the 16V from VW
