Tom Anderson wrote:

Indeed, and i never said it didn't. But it does tell you which cars to
check - your list of suspects has a length equal to twice the number of
cloned cars, as opposed to
however-many-tens-of-millions-of-cars-there-are-in-the-UK, which i would
say is an improvement.

It tells you to check cars without giving much of a clue about where to
look.

Not exactly much use is it?