Wandsworth have announced they're doing away with paper resident's parking permits. They introduced paperless visitor's permits some time ago - the parking warden just checks the reg number of the car against a data base, if it's not displaying a permit.
But if no cars are displaying permits, would they have to check each and every one? At the moment a 'spotter' drives round on a scooter looking for cars without permits and sends foot wardens around to do the paperwork.
Number plate recognition cameras mostly couldn't work on the move - with densely parked cars.
Any clues?