To ride a road-legal quad bike on the highways you must have a full car licence, or a category B1 motorcycle licence if it was issued before January 1997.
The vehicle must be registered with the DVLA, taxed, have a valid MOT certificate and a minimum of third-party insurance cover.
Off-road quads don’t need any of the above and you can be any age to operate them.
However, you must only drive the vehicle on private land with the owner's permission.
When using an off-road quad for agricultural, horticultural or forestry use, the vehicle must be registered with the government as a light agricultural vehicle.
It can be driven on the road so long as it's within 1.5km of the site it's being used for work on.