Ah, so my lovely shiney new car 04 plate 22000miles has this problem. thought it was quite dodgy and after coming out of a 6 hour drive i am pretty sure its showing the signs. I can only assume because it did so few miles in its first 3 years the problem didnt rear its ugly head untill out of warranty and noones bothered to sort it. the absolute bonus though is that i took out a year warranty when i bought it, 300 quid well spent if you ask me! phew!