Well I finally tracked the creaking noise to my drivers side seat belt post. If I squeeze the latch which the belt clicks into while driving along the creaking stops. There seems to be some "give" in it which isn't present on the other seat belt post or other latches. My question is has anyone else experienced this and found a cure or should I just get the dealer to replace in under warranty? Oh and its on a 67 FL S3 saloon.