Insurance ...
Unfortunately, as long as the UK insurers fixate about *who* is driving a car, then ANPR is pretty useless as a tool for catching uninsured drivers. Unless it's combined with facial recognition software which links into the DVLA driver photograph.
How many cars merrily whizz past the ANPR vans, flagging up as "insured" when in reality, because the driver isn't on the policy (for whatever reason) it isn't "insured" ?