I will answer this for you, first of all what year is it?
126k isn't mega miles for them as long as they have been serviced regularly.
Make sure the oil is clean and still golden
Things to look for is, rattles from the engine, could indicte a worn chain/tensioner.
Blue smoke from the exhaust on over run and hard acceleration, could be valve stem seals or rings
Check for play in the steering, if it's been lowered previously without rack spacers it can bollocks the steering racks
Older preface lifts are starting to show rust on the rear arches but it's only been a small number
Make sure the gears select ok, if it struggles with reverse the clutch could be on its way out.
Also check for whines and crunches from all the gears, usually 2nd and 4th, if you test drive it, show the gear lever who's boss and you will feel a small crunch if the synchros a worn.
Then just general 2nd hand car checks.