At 84,000 miles it will be needing a new cam belt, unless you have evidence of one having been fitted in the last 30,000 miles or so.
When I bought my 54 plate Gen 3 the dealer put a nw belt on at 51,000 miles, and left a nice little sticker on the cam-belt cover to show the mileage it was done at.
Thanx for cam belt tip. I'm gonna service her myself (well with bfriend help) and i'm then getting her checked over properly by my garage to make sure everything else is ok. The guy i bought her from said the cam belt had been changed but i don't 100% believe him.