Many thanks for all the advice. Mrs Botchjob is reluctant to go to our local A&E with her slightly hurty elbow, and i can't really blame her. Bike shop says it's just a new back wheel and are fixing it today. The company whose van it was (actually subcontracted to the council, not owned by the council itself) have been in touch and it sounds like they're happy enough to pay up without being difficult about it. The driver was clearly not paying any attention whatsoever but without any witnesses there's no point in trying to take that side of it any further. Just very lucky he wasn't going any quicker...