OK, a view from this side of the fence....
ANPR is invaluable. Most people committing one motoring offence linked to being responsible for the vehicle commit other offences as well - for example, an untaxed car probably will be uninsured, without MOT, and quite possibly driven by a disqual / unlicensed driver. It will usually be driven more dangerously than others, and may often be involved in other crime - burglary, etc. Many vehicles are kept "untraceable" for a reason other than simple lack of funds to insure.
But on it's own it's useless - it can only effectively be used in conjuntion with police on the ground stopping the vehicle at the time. Typically we use a couple of long dual carriageways with no exits in between - the ANPR crew can scan the vehicle and let us know about 3/4 minutes before it arrives. We've usually got a lane coned off to deal with it, typically with DVLA present.
In terms of cloned vehicles, my team are usually pretty able to tell whether the driver is genuinely startled to be stopped, or trying to hide something.
Penalties are the big problem though - as someone else has mentioned, as long as magistrates keeping handing out endorsements and bans to unlicensed drivers, we know they'll be back on the road as soon as we've chucked them out of the nick. It's disheartening to say the least, although luckily round here we have a few mag's who will happily send people down for repeated offences.
The handy thing is that any fines, etc don't go to camera partnerships, so the incentive to raise revenue is removed.
It also means we can do a lot more, a lot quicker - typically an old style PNC check on a vehicle took 1-2 mins and even then may not have had correct insurance data...with MOT being linked into the check as well, we have more chance than ever to remove the real scrotes from the road.
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I have been to Sunday markets where they make up a set of plates for £20 no questions asked.
Please let your local Trafpol know about this !!!