i needed a cam belt change was the renault laguna,basically along the same lines as you,mileage was low but time wise it was due. when the belt was taken off from 1st impressions it looked fine until we turned it over and between the teeth the belt had started cracking.looked at the new 1 nothing,my m8 said in his opinion it might have been good for ages BUT its would be sods law,for the sake of a few quid now,could end up costing a fortune if it had let go coz i was being a tight arse.