Mentioned this in a previous post, but last month I had the cambelt done on my MK5 GTI but Stafford Audi - £338 all in, including the water pump, stamp in the service book, usual warranty on the work and the parts.
It's only £249 if you don't want the pump changing, although you should do it anyway.
Service was excellent. They are advertising the 'offer' on ebay or you can ring them direct. Speak to Andy in service, top bloke