Rule 157: Vehicles banned from the road
Certain motorised vehicles do not meet the construction and technical requirements for road vehicles and are generally not intended, not suitable and not legal for road, pavement, footpath, cycle path or bridleway use. These include most types of miniature motorcycles, also called mini motos, and motorised scooters, also called go peds, which are powered by electric or internal combustion engines. These types of vehicle MUST NOT be used on roads, pavements, footpaths or bridleways.
Laws RTA 1988 sects 34, 41a, 42, 47, 63 & 66, HA 1835 sect 72 & R(S)A sect 129
Why the capitals matter. The Highway Code writes a rule in capitals — MUST or MUST NOT — when it is backed by law, so breaking it is a criminal offence. The rules that do not use capitals are advice.