Sorry to hear this fella.
This is of no solace to you but I feared mine was going down the tensioner fail route - it's a very early June 09 model. It was making the classic rattly noise on start up so I was equally scared. Consequently, I had a new revised one fitted along with a new water pump for £530 at a well known independent specialist up here in the north. Even they had to fit it twice because the first one was faulty and sounded worse than the original. Anyway, when they stripped it they could see signs of wear on the plastic housing which is usually an early sign of wear.
Touching wood and hoping for the best, it sounds back to normal now on start up so I'm hoping I've got away with it. Not happy with having to pay £500 odd but have reconciled myself with the fact that if it was a normal cam belt driven engine I'd have had that and the water pump changed at 4 years old so I have likened it to that in my own mind (even though I know it is not the same).
VW really need to come clean with this and compensate customers of these early cars otherwise they will lose plenty of repeat custom. However, I fear we all know that they won't - they just need to look at the Mk 7 section to know how many of them they can sell!!!