In these days of cameras and CCTV everywhere I'm not sure why pay and display is necessary in car parks. Why not just have number plate recognition on the way in and out. Park for more than 2 hours and get a parking charge. Park for more than 6 hours and get a hefty parking charge/fine.

Perhaps such a scheme requires registration for first time users, but that is no different from parking metres across much of London.

I would add that the same technical solution could be implemented for parking on Dartmouth Road and other areas with limited parking bays. The difference here is that you replace the parking enforcement team with the use of a camera system that can see if any car outstays its welcome. The cameras could either be mounted in CCTV columns or small drones that could constantly patrol the street.