Numbers on Cars

[NELLY]

Correct me if i am wrong, but here in the UK, I am lead to believe that it is illegal to have Numbers stuck onto a car, (everyday driving), supposedly encourges racing.
Is this true?
So what I am asking is if this is the case, does the same or a similar law opperate in France.
One guy within our party is contemplating taking his race car down (has numbers on Doors/Bonnet).

Any info a help.

Neil.