Electric vehicles, AFAIK, need no UK licence unless they are capable of more than 20 mph (or is it 25?).

Bikes, milk floats and mobility scooters

Ha! Mobility scooters at 20 mph on a pavement? They are a menace at anything more than walking pace, and I walk fast. I would not be too cautious to call such idiots, idiots. Disability and idiocy are not mutually exclusive.