Interesting article on the beeb today about the number of drivers stopped doing over a "tonne". http://www.bbc.co.uk/news/uk-35654611
The highest speeds clocked after the BMW [M4] at 156mph, were a Mercedes C200 doing 155mph on the M1 in Hertfordshire, and a Jaguar at 144mph on the M4 in Gloucestershire.
Pretty impressive that C200 given it has a top speed of 146mph.
But the really interesting bit is ""But yes, I was over 100mph. Modern cars are very safety engineered but nothing's going to stop two ton of vehicle at that speed very quickly. It's made me more aware and I use cruise control now much more to keep a check on speeds." - this chap gets 6 points on his license for doing 103mph and his solution is to disconnect himself from the speed controls.
I really think we need to go back to a policy that educates people how to determine a safe speed for the conditions and not focus on the numbers so much. I reckon people would drive much slower where it counts if we did this.