An archaic law that the police were not in the least bit interested in enforcing as they knew it was nonsense. As evidenced by the numerous times I passed them in the street without incident the past 18 months. This current crackdown is all because of the media hysteria surrounding a minor celebrity death.
As I mention above, there's a reason countless normally law abiding citizens decide sod that and take to the roads on this environmentally friendly device. They know, and the police know, that it's a winner in the long run. But now that's all changed because the general public are all up in arms because media have told them we're a menace to society and the police have to be seen to do something about it.
Hopefully it'll blow over and common sense returns.