OP – I’m glad that you’re ok. But what he did was intentional; I’d press charges!
IMO, the motorist probably didn’t go to the cops because of a guilty conscience; he did so out of self preservation. Get his name and look into his background a little.
I’m American, and many professionals here belong to some sort of professional organization or are regulated by some start body. I assume that its the same in the UK. Lawyers belong to the Bar Association, Engineers would be licensed by a state professional board. Other professions have similar bodies. And none of them look highly on poor conduct (such as assault) by their members!
If the motorist belongs to one of these organizations, file a complaint with them. A written statement from you and a copy of documentation from the Police that he admitted to it would be all that you should need. He’ll have to respond, and there’s a good chance that they’ll suspend his membership or put him on some sort of probation for a period of time. That will remain with him a little longer than some stern words from a cop!
Remember, his intentional actions could have killed you!