I looked at a pre production BGTV8 which was used for Police evaluation. A friend was interested in buying it but at the time it was rough and the asking price was huge.
We went all the way to Glasgow to see at and didn't even get offered a cup of tea!
A friend of mine (traffic motorway policeman) had that car on the M1. It had an extraordinary police sign folded flat on the parcel shelf. He would drive next to a (say) porsche, get the challenge accepted, then pull in front, reach down and pull a lever (like our rear easyup catch) which pulled a cable which lifted the Police, Pull over sign.
He seemed to think it was great fun. The problem with the car was that it couldn't hold all the emergency stuff they needed to carry for accidents etc.
Long time ago, different world.