Just a word of warning, Although it's entirely your call, you have the "gut feeling" of whether the chap will pay up etc.
But if you just "inform" your insurance company of someone hitting you, and you don't claim on your or his insurance, you have still in the mind of the insurance company "hand an accident" and they will load your policy up next renewal!!
It is bloody wrong but they do!! I myself was sitting in my car stationary waiting for someone to come out of a car park once, and the lady hit me, admitted it as her fault.
After various conversations with her "rude" and damn right obnoxious husband trying to worm out of it with statements and rants down the phone at me ranging from it being my fault to her not even being there and made it up, to me hitting a wall in said car park etc they evenutally agreed to pay a resonable price after me getting several quotes.
I resorted to contacting my insurance company to get them to contact the person to "scare" them into proceeding with claim before they aggreed on paying and later informed the insurance company that "no claim will be made".
They now apparently class me in the "higher risk" and I am more prone to accidents thus higer premiums ??? even though I was just sitting in my car in a private car park stationary and some lousy driver who couldn't drive one of those 4x4 things and misjudged her vehicle size!.
Beware, you have now been classed as having had an accident in insurance terms!!
i don't know if all of them do this but the one I was with was a certain grey mammal with a trunk ;-)