How on earth would they catch you? (I mean, how would they found out. Not that I drive lawnmower so fast I can escape in a high speed chase).
Lawnmowers would be exempt. And probably mobility scooters and tractors. It’s a storm in a tea cup, so people who need an excuse to get irate about the EU and the tabloids to make a fuss about, for the ruling classes to use to divide and rule now they can’t use ‘Brexit’ anymore, Don’t rise to the bait, and hound our politicians into doing a proper job of work of running the country instead.