about 125,000. the car itself seems to have been well looked after (the last owners cousin, i think!, runs awesome gti, so i dont think it has wanted for much in its life).
have been looking through other threads on this problem and it seems the hall sender has been the culprit more often than not, as the misfire is far more prominent when the car is warm.
anyways, have ordered a hall sender from ANDREW PAGE (£33.00, cheaper than a new distributor, and since have just done the oil seal, didnt want to pay the extra for a new unit!) so i'll have to see if that sorts it....