Highway Code Rule 36
There is one class of manual wheelchair (called a Class 1 invalid carriage) and two classes of powered wheelchairs and powered mobility scooters. Manual wheelchairs and Class 2 vehicles are those with an upper speed limit of 4 mph (6 km/h) and are designed to be used on pavements. Class 3 vehicles are those with an upper speed limit of 8 mph (12 km/h) and are equipped to be used on the road as well as the pavement.
Section: Rules for users of powered wheelchairs and mobility scooters (rules 36 to 46) Subsection: Powered wheelchairs and mobility scooters (rules 36 to 37)Highway Code Rule 37
When you are on the road you should obey the guidance and rules for other vehicles; when on the pavement you should follow the guidance and rules for pedestrians.
Section: Rules for users of powered wheelchairs and mobility scooters (rules 36 to 46) Subsection: Powered wheelchairs and mobility scooters (rules 36 to 37)