"We use ANPR to target criminals and unsafe drivers..."
No, ANPR cannot target unsafe drivers unless they are already known to you. They don't measure speed, they don't check if a driver has a licence, they can only tell if the car is taxed, MOTed and insured by someone.
You only have to drive down the A12 between the M11/A406 and A11 junctions to see what good the dumb cameras on boxes do. Everyone knows where the speed (sorry, safety) cameras are, and everyone drops their speed by 5 to 10mph as they approach each one. No big deal, everyone does that, but what the camera can't see is what happens in between, namely the idiots who use the lanes as a mobile chicane/slalom and accelerate down the inside of people as soon as they clear a camera like a rolling start motorsport event!
I keep meaning to blu-tac my mobile to the windscreen in video mode, it's only a short drive, and you're guaranteed at least one idiot (normally more though).
If I was a local traffic cop, with a quota and an unmarked car, I would spend my entire life on that stretch of road... Unfortunately we don't have many real traffic cops any more, we just have yellow cash machines, whoops, sorry, safety cameras.
So you can't target unsafe drivers with an ANPR camera, you can only target unsafe drivers you know, and you won't get to know them unless you have some real traffic cops about - or the idiots wrap themselves round something, or someone, else.