Stevo, that's great, thanks!
The car in question has had the water pump done for a metal one, I couldn't see any signs of leakage when I checked in the usual areas, apparently the owner has changed 3 out of 4 coil packs, and it's definitely a 225 (paperwork, age, features etc). Didn't realise it was quite so easy as changing the steering wheel to fool people, though.
That's the first I've heard of the rear door locks, doesn't sound like much fun to have to do so we'll definitely keep an eye out for that.