[CheGuevara]

As above, I'm thinking that a sore back or stiff neck would force the issue to be followed through - if not by the police then by the insurance company. Would he not then lose his no-claims (assuming he has any)? Not to mention, what insurance company is going to want to touch him after it comes out that he's used his vehicle as a weapon and fled the scene?

And if all else fails, well Karma is still a B!tc# - epsecially when it finds out where you live and lobs a balloon full of brake fluid at the hood of your Mercedes in the middle of the night.