1) The car, a 2006 plate has covered 127,000 miles, appears to have been serviced well, though not by a main dealer, should I replace the timing belt ? 2) There's a lot of "clutch shudder", the car was advertised as clutch squealing, I suspect it will be the dual mass flywheel, any tests I can carry out to confirm this ? 3) Aircon doesn't blow cold, a re-gas I suspect, but are there any known common problems with this model ? The annoying bits :- 4) The drivers window doesn't go up correctly, it sticks, then might go back down, it takes four or five presses to complete closing the window. 5) Passenger side window will go down with the drivers window control, but not back up, you have to use the passenger control to do this. The really annoying bit (to me) 6) The dash display shows MPH 0 and MPG 999, the MPG for the current journey does work, this rises and falls as expected, the other two are for overall average speed and consumption I think ?