Bring your sniffer dog!! Seriously though,dont be afraid to get down on your back with a powerful torch and check every inch for corrosion/fillers.They are a bit rust prone especially uk imports.Engines/gearboxes/suspension are strong enough.Check the spare wheel to see what the tyre is like(worn to one side etc) and then taken off.See if all tyres are the same make which is a good sign of careful ownership.A lot were crashed so go in with your eyes open.A good one is a gem,a bad one will be a wallet bruising dog.