Small point of confusion. There’s a difference between a dropped kerb designed to allow wheelchair users to cross the road, usually found near junctions in urban streets, and a kerb that has been dropped to access a residential driveway.
The urban dropped kerb is found near crossings to allow for easy access for wheelchairs, pushchairs, visually impaired and cyclists to access the crossing or simply cross the road safely. Most councils now have devolved parking enforcement responsibilities and blocking one will earn a ticket.
A kerb that has been lowered to allow access to a residential driveway does NOT have the same rules. This is covered by the laws surrounding obstruction of a highway. This simply states it’s an offence simply to impede progress ALONG a highway.
(1)If a person, without lawful authority or excuse, in any way wilfully obstructs the free passage along a highway he is guilty of an offence and liable to a fine not exceeding [F1level 3 on the standard scale].
So this is interpreted as an offence to stop someone from using a highway…… not from leaving one. Police will take an interest if you can’t get your car onto a highway in order to use it, but not if you are prevented from leaving it.
Basically advice is that blocking driveways is a civil offence, but it’s been stretched to help those who can’t get their car out of the drive.