I think i'm pretty ok on what to look for.

Rust on sills, bootlid, bonnet, under bodykit, under door sills, boot floor etc.

Check for new panels and how well they've been done.

Smoke on start-up and whether it continues when its warm

Knocking, weird noises, bearings etc.

Other than that I should be ok.. 2 of us going so if i forget then he'll pick up on it.