I dont think there are any specific points to check on the sportings, nothing notorious. They're quite stable little cars. Just do the normal checks as with any used car, head gasket, rattles, blah blah. Check the front wheel arches for any rust as that's the first place it tends to appear. Make sure all the electrics work. It's great if they have the red key but not a dealbreaker. When it comes time for you to sell up, yellow cars are always in high demand so bear that in mind. If I think of anything else I'll add it.
Good luck!