It looks ok rob. If the chainset is on the way out it's going to cost u. I have a chain measuring device if u want to barrow it and check it. That's if u don't take up Alfie's offer.
Good man Rob, do you think you will be able to make the transition from running a pogo stick to running a set of forks??
My father has a very similar Trek and they are sound he bought it 2nd hand lightly used and absolutly mint for 300 euro, so that chap is dreaming with the price tag only worth half what he looking for!