Sorry to hear about your problems CoopersE90. The problem I have is that I don't have obvious symptoms, it is very hard to replicate the problems. I'm going in on Saturday to have a fault code cleared (full catalytic converter) following the clearout process I did down the motorway. I've been told clearing this code as I know its there may solve the problem as having codes in the system can mess stuff up! If there are no other codes present I will drive away and see how things go, if my symptoms persist then it will go back in. I'll be very interested to know how you get on as you have the exact symptoms I do. Please let me know what your dealer comes up with!