That's something different. Of course there are loads of people speeding too.
One other thing I notice is that different motorways in the UK have different characters. On some, yes people do tend to stick to the limit, and on others not so much. I haven't spotted a correlation yet with the locations of speed cameras.
Are you kidding? Try doing 70mph in the third lane of a non-busy motorway and see how long it takes someone too be dangerously close behind you.