No mention of number of owners?
FSH can mean a lot of things to different people, as long as its been regularly serviced then its no drama.
Receipts for tyres rather than physically whats on there today would tell you more, but its not just tyres, brakes and exhaust for example are just as telling if they look like the cheapest possible versions.
At 85k miles though there will be risk attached, even with a perfectly serviced and no expense spared car. Obviously the risk goes up on an abused one.
I used to know a car valeter, freind of a friend. What he would do to a car was quite amazing in a few hours. He was permanently employed by a 2nd hand car dealer (quite a big one). How a car looks and can be made to look means I wouldn't place a lot of stock by how it looks sitting on the forecourt!
The only real way to be sure is to commission something like an RAC vehicle inspection (or get a decent mechanic to do one if you know one). Not cheap but potentially worth it.
I nearly bought a car once (my first car in fact) an MG Metro, as it happened my grandad was lending me the money, and he was a long term RAC member and at the time got a massive discount on the inspection service.
He said he would pay to have it checked. This was from a main rover dealer. The report was shocking. Turns out the car had been in a fairly significant crash, someone at the garage had repaired it, of course focussing on cosmetic rather than mechanical.
It looked lovely, and had good service history etc, it had been well cared for, but then it had been smashed and the owner didn't want to drive it, hence the repair outside insurance and the selling on. It was technically road legal, but you wouldn't have wanted to drive it really, as technically road legal and safe aren't exactly the same thing