£600 for a driver!
Stay away........... can pick them up for half that.
Mileage isn't really a problem on the golfs. Check there is no smoke on start up, and make sure the engine is cold when you first look at it (pierburg carbs on these tend to be a pig for cold starting)
Battery trays are known for rusting as are the front chassis members (under battery tray)
Check it goes through the gear smoothly etc
Best bet is to have a look on ebay............ they come up nice and cheap and because they aren't Gti's tend to stay cheap!
Easy to work on cars, and cheap parts still readilly available.