Living in North Wales means being more aware than most of the risks we run every time we take the car out on the roads. Up here, 30 miles an hour means 30 miles an hour and not 31. Stick to it or you risk being confronted by officers of the law leaping out of a cunningly disguised horsebox and forcing you to an abrupt halt. That being the case, this seems a natural progression in their remit.
If anyone is worried by this and feels they need help in brushing up their accent, grammar and general command of the English language, I shall, of course, be happy to help, on payment of an exorbitant fee naturally.