I bought my 2006 gti recently with 43 on the clock. Cambelt hadnt been changed. It's upto you at the end of the day but for me, for the sake of £300, I got it changed for peace of mind. When they took it off there wasnt a mark on it but it could have come off completely battered, so my advice is just to get it changed.
If it snaps, then its going to definetly cost you more than £300!