I have one myself. Is the one you're looking at a manual or auto? Mine was from Derby, and had rusty rear arches which are getting sorted in the bodyshop now. I think a majority of them came in LWB guise. Take your engine diagnotic tool with you and see if there are any faults or previous faults in the memory. Mine has 77 k miles, and failed its MOT which I put it through when I got it. It failed on both front shock top mounts, 1 x leaking rear shock, and low rear pads.
Make sure all the elecs work and the climate too. Just generally what you would do when buying any other make of car really.