Hi Mr Barlow
Firstly, I’m glad you are okay.
I know it’s too late now but it’s a shame you didn’t at least get the car reg of the man who was on your side of the argument. The first thing I think I would have done, if it were me, is grab my mobile to use as a camera. But I understand how in the heat of the moment these things escape us.
You weren’t filtering illegally, AFAIK, and the speed you were travelling at is within guidelines which, from memory, should be no more than 20mph than the traffic speed. At least that’s what I was told the once pertaining to motorway filtering.
The one thing we are told to do in any road accident is is never admit liability, even if it is very clear who is to blame. In these circumstances, where there could be a grey area, it’s reasonable to just say 'knock-for-knock' and both learn from it but he sounds like he’s accusing you of being culpable. (He may have come down to Earth since and in the cold light of day have acquiesced a little to your and the other driver's point of view).
Even a small dink in a car’s bodywork costs a ridiculous amount to make good. I remember the quote I got to get rid of a nasty scratch on my Mazda’s bonnet for £300! He said it can only be done by taking it off and re-spraying the entire bonnet. (I thought they could have just done that small area). So he may be looking at taking the same hit, no pun intended.
I think the most likely option is for you both to put it to your insurance companies and let them argue the toss. Your premium shouldn’t go up unless he successfully claims on your insurance or you do, which sounds like you don’t need to anyway.
Best of luck mate and, without wishing to sound like your dad, when it comes to motorcycling it’s imperative you treat every other road user like a blithering idiot on a life’s mission out to get
just you. (I know you know that but the urge to say it overpowered me
). You may want to ask a police biker when you see one for a more interested and concerned take on the matter
Tone