Greenbank said:Return the filled in form with none of the above ticked but write in something along the lines of "Other - Cyclist" next to it.
Ignoring the form will do nothing but annoy the Police.
If you're not already a member, join the CTC (both you and your son) and speak to their legal representatives. They will help people out who weren't members at the time of the incident, but you have to join up for them to represent you. 50 odd quid is a small price to pay for legal representation, especially when the firm they use (Russell Jones & Walker) are specialists in representing cyclists.
I'd never want *mandatory* third party insurance for cyclists, but I'm happy that I get it thanks to the CTC. It would make dealing with something like this considerably easier.
I had been meaning to jin the CTC for a while and had even filled in the form about two weeks ago but I'd left all my cards in the office.
Anyway, I did this on Saturday (incident was on Friday), mainly as future safety thing, but didn't think they would be able to help retrospectively, but I'll give it a go see what they say.
Thanks to everyone for your comments so far, but please continue to add thoughts