Just bought my Clubsport S and absolutely love it. However after I had adjusted the seat (lowest position possible)it squeaked like mad. Therefore I googled the subject and found myself on here. Turns out others have had the problem and using a combination of suggestions the problem is sorted.
A. Raise the seat one notch from the bottom.
B. Squirt white grease on the 4 adjusters on the seat runners.
Hey Presto, no squeaks.
So thanks GTI forum!!