Buying a good car today (whatever make or model) is a minefield when secondhand or "pre-owned" as they prefer to call them these days......
Have personal experience of the "one careful owner , an old lady that only used it to go to church on a sunday" sort of car, bought a mark 5 cortina once that only had 21k on it, and "fsh" that turned out to be an ex-taxi that had gone over the clock by 21k..........(in the days when they could go back to 000000 after 100k!!!)

I pay very little attention to the mileage reading when looking at a car. I do 25-30k/year anyway so even if I buy a low mileage example it's only going to be low for a couple of years
Likewise, FSH can mean nothing... Look at TB's "secret" purchase... A low mileage example with FSH. It was a shambles

For me the important thing is condition. Interior and exterior condition tell a lot of stories... Are there floor mats fitted? If so, lift them and check wear on the carpets under as well as on the mats. Does the outside look well cared for? Does water bead properly? Obviously, check for rust etc... Stonechips on the front. If it's a low mileage example, why is the front peppered? If it's high mileage, why are there very few? Has it been sprayed? If so, why?
Lift the bonnet (before the engine is even started). Is the oil and coolant level correct... Not just "within the marks" but at (or very near) max. Colour of the oil/coolant. Is the screenwash topped up? Is the engine bay reasonably clean and tidy? Obvious missing bolts or cables routed poorly? To me, an oily rag tucked in the engine bay (safely) can be a good sign that the owner regularly checks the oil

Then think about starting it and do all the usual checks... Especially all the electrical items. Does it warm up correctly? Do the fans cut in?
Once all this has been checked I think about a proper road test, taking in all types of driving if possible
