Ours has been like that since we baught the car 30k miles ago, your knees up past your ear before it actually bites
However, I'm not going to change it unless it actually fails, or starts to slip. The DMF will undoubtedly need done too, and thats £££, with the other option being a single mass unit which is less money but still expensive.
Not to mention the fact that changing it is a bit of a ******!
Saying all that, i dont actually know if the TDi has a DMF, so it might be less expensive in your case.