>Then there's ANPR (Automatic Number Plate Recognition) - video
>cameras in police cars (sometimes front and back) continually
>scan passing cars, use OCR to determine the registration number,
>check it against a database of cars with "problems", and alert
>the crew if it finds one.  So if you're driving a stolen car,
>just driving past (or behind) a police car may be enough to get
>you nicked!

Not just stolen - it also flags up if the tax disk has expired or the MOT 
expired as well, both 'excellent' reasons for stopping you. 

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