You do not need a licence to drive a mobility scooter or powered wheelchair, but you may have to register it. Only certain types can be driven on the road.
Mobility scooters and powered wheelchairs come in 2 categories:
class 2: these cannot be used on the road (except where there is not a pavement) and have a maximum speed of 4mph
class 3: these can be used on the road and have a maximum speed of 4mph off the road and 8mph on the road
You do not need to register a class 2 mobility scooter.
You must register class 3 mobility scooters.
For Further info directly off the Goverment Website: