So there's the answer folks. How to deal with being rear-ended:
Show no grace, no charm and no understanding. Take no account of the age of the other road user and be verbally fairly aggressive throughout.
I love the motorist being told how many miles the cyclist rides every year. I think they do a Blue Peter Badge for that.
When he offers to pay for the damage (although quite clearly flustered and a little upset) he is told "You will be, whether you want to or not". He'd already said he would.
The counter-cry will be that he is in a metal box, protected from.. etc etc... Of which the flipside is, he is an aged man who was thrown by having a bicycle in front of him. He doesn't seem to have been much of a driver, but the rant was undignified and approaching the puerile.
It's a bicycle; it was a bump; life goes on. I'm still chortling at the unleashed rage in all this.
(I've edited out a comment: I'd thought this was Gaz's own video - most of which I rather like - and had written something questioning his attitude in this clip. Having read the thread properly, I see it wasn't him. I still like his stuff. Apologies Gaz if it was read before my edit.)