Sorry Jim, been a bit absent on the forums over the festive period.
The one on ebay from Zaustworx, £60 I think I paid. Had my local garage fit in when I had some other bits sorted.
Still enjoying it, it's an improvement over the more refined stock GTI exhaust but at the end of the day, it is still a 4 pot turbo so it's never going to sound like a VVT engine approaching it's redline!
My decrease in average MPG backs this up too, often find myself shifting a bit higher up the rev counter just for that louder DSG pop. How childish!!