This has been the same for a far as I can remember. Clobber the normal folk pottering along at 35 in a 30 or 45 in a 40, whether it be delibrate or not, it isn't crime of the century and there should be an variance of 10 - 15% for "normal" driving. Most roads govern themselves and appropriate speed causes no issues.
I do agree with strict limits around schools and in heavily built up areas.
What about the cnuts who overtake on blind bends, tailgaters, people with phones to their ears, drink drivers, no tax or insurance. They can run around and do what they please.
Detection rates for offences has never been lower in my opinion.
H.