not sure how it will work in practice if the cars are " plain clothes " unless they are all Aston Martins with rockets and ejector seats or will they have their own colour light on top of the car !
Planning is an unnatural process, much better to just get on with things, that way failure comes as a complete surprise instead of being preceeded by a period of worry and doubt
I should imagine they do so already, but lets be real we will never know as it is a matter of national security so are we all, big brother not just on TV you know he is every where.
"My lovely car now sold onto a very happy new owner. I still love this marque and I will still be around, preferred selling to breaking, as a great runner and performer"