...as andy says, self-inflicted wound by the "powers that be".
ANPR/speed cameras/congestion charging/insurance/MOT/licence data bases work on, now let me see

, oh yes.............NUMBER PLATES!!!!!!!!!!
If your plates "look" kosher, you won't get pulled, easy.
Beer mat in the windscreen? No probs.
No insurance? Go right ahead sir!
How do they stop people making false plates? Well, you have to go along to the makers with all your documents, mother's maiden name, blood group, wait a couple of days and then go back to collect them. That'll do the trick. Yeah, right
What part of "criminal mind" do these knob-heads in government not understand?
How do you stop people doing naughty things? Make it illegal! Job done. Next..........