Don’t know why I put under 440 when it's over. The scooter must also have a foot operated brake.Don't you mean over.
This also might be useful, it's taken from the GOV website.
Motor tricycles
If you hold category B1 entitlement (trikes and quads), when you renew or replace your licence after 19 January 2013 it will show categories B1 and A. The A entitlement will be limited to tricycles and you will not be able to ride motorbikes you were not previously allowed to.
Provisional licences now only cover you to ride motor tricycles if you have a physical disability. Driving tests for 3-wheeled vehicles are only available for physically disabled drivers.
Non-disabled drivers who want to ride motor tricycles need to pass CBT and the theory and practical tests on a 2-wheeled motorbike.