I'm not defending the person in question or the specifics of the incident, but I hope people realise that stopping on a motorday can be very dangerous and as long as they report the incident to a police station within 24 hours they have not broken any laws.
Entering this registration into various websites (webuyanycar, comparethemarket etc) renders no results, it's probably not the correct reg or the story is a hoax
This needs to be passed to the police!