I'm glad it's sorted Pete. Did you also both sign some sort of statement of settlement? I'm not sure what standing such a statement has in legality but having once sorted out something privately for the in-laws involving a smash, the letter I wrote up and got the other party to sign later came in handy when his insurance company, whom he'd innoncently informed of the accident and private settlement, then began, mistakenly, another claim. The produced letter, stopped it in it's tracks.