Hi, My 2p's worth...
Avoid VW dealer, as without warranty it could end up costing a lot, although somewhere in this thread is an excellent main dealer mentioned when dealing with this issue - 'RocketRossUK' used them I think.
To me you have two options - take out an official VW warranty then you are covered should it go wrong, or as you have done contact a few indies (or do it yourself if your skilled enough - as per 'andygo'). Most people have just had the tensioner swapped out, others have also had the chain. I opted for the tensioner only, some details page 14 I think on this thread.
Pays for your money takes choice I guess, choose which ever option gives you the best piece of mind. The VW warranty will not allow you to make a claim within the first month, you can also pay monthly if you wish.
Good Luck!
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The dealer RocketRoss used is the one I recommended, which is White Rose Volkswagen now called Skipton Volkswagen. I would recommend talking to Ben Smith in the service team, understands the issue. My 59 plate GTI had 50k on, and they rectified with minimal cost to me. As it has been said many times already, VW should be paying for this as the part used on Early MK 6's is substandard and poorly designed.
The rattle I had gradually got worse and I decided to replace before it went, with the garage confirming a slack chain but then also found other things which were fixed.
Good luck and if you intend to keep the car then it's worth having done.
Neil