Yeah but to go around claiming to take peoples numberplates to the police.
Simply inform them and if they get touchy then offer to hand it.
Seems a bit arsey to me just saying "here's the plates".
so when your about to die in the middle of the motorway because youve filled your engine with de-icer and its exploded and the ambulance cant get to you we'll all just sit and tut at the drivers blocking the hard shoulder 
So when you're speeding along an empty motorway at night, I'll report your numberplate yeah?
Would a broken down car driver be a complete wayne kerr too?
Swings and roundabouts, fair enough inform them, maybe they could move over if they worked nicely enough together.
I'm suprised he didn't get punched. Before you read that as "Bellend would punch him", no I wouldn't.