things to check:
when you get there see if its been started, if it has let it cool down before you start it (one of my mates nearly got ripped off because he viewed a car what had been warmed up, turned up unexpected to buy it, seller fired it up, rattly as fook...)
start it up and make sure its not smoking and no rattles, knocks pings etc
check under arches and sills for major rust spots
check mot notice for advisory's, have a look at tyres, also see how dirty the oil filter is, spark plugs, oil itself etc give yaself a vague idea when it last had a service

also if its got the plastic arch covers check behind them, my driver wasnt meant to have em standard, had a look behind one, no arch left just rust

hope this helps

sam
