There is a contravention of being adjacent to a dropped kerb, one lowered to meet the level of the carriageway so that pedestrians can cross the road, cars can enter a resident's drive and cyclists can access cycle lanes.
Adjacent is usually interpreted as overhanging and a few inches might, especially in the case of a wide access, be regarded as trivial by an adjudicator.
A PCN has been issued for this car being adjacent to a dropped kerb. It simply isn't.
The tapered (it slopes down) kerb counts for nothing as it isn't at the level of the carriageway. This is a perfectly considerate piece of parking.
Perhaps the parking of the residents of, and visitors to, Barnet is getting better such that traffic wardens have to issue PCNs to cars which are obviously not in contravention to make the ticket targets that are meant to not exist but perhaps do.
A resident should not have to defend themselves from such trickery.