Get the Old Bill to nick him for driving without due care and attention, and that will be the end of it.
I had the same problem when a motor bike that hit me in a Range Rover completely their fault, Then
he and his passenger tried to sue me for damages..!!. Old Bill nicked them for driving without due
care and attention, they were not going to nick him until he tried to sue me for compensation.
Go and have a chat with them.