Beware of BC legal beagles if you are a member.
I had a bad 'off' almost 7 years ago, and just before it was up to court, BC's appointed legal 'experts' tried to settle out of court for 1500 on my behalf without even telling me - Reasons given were they were scared we would lose the case as I wasn't wearing a helmet, and because I didn't call the police at the time of the accident.
Now I would have thought the fact I was unconscious and being carted off to hospital in an ambulance with a gaping head wound would have been good reason for me not thinking of picking up the phone.... And as BC solicitors, why the hell were they being submissive to me not wearing a helmet and virtually accepting defeat? I found the whole thing distasteful and insulting, and it took them 3 years to get that far. Not wearing a helmet/not calling the rozzers could be interpreted as contributory negligence, apparently.
I binned them, went with a no-fee shark and got what I was entitled to within 18 months, we settled out of court for 7000+. That covered the damage to the bike, my clothing, loss of earnings and a wee bit for the permanent scar on my napper caused by the negligence of others.
If the guy doesn't want to go via insurance there might be a good reason for that - Either he doesn't have any, or he has a large excess on any claim. I would get the bike checked over as BeSpoke and NAF advise, and take it from there.
Were there witnesses? If so you should tell the guy you're reporting the whole thing to the police.
Oh, and if you need nice carbon bars, I have a spare set of bontrager race xxx lite 44's in the shed going spare.....!!!