Well today i spotted a black Audi A4 with the old type numberplate but it was a 51 plated car.
I thought it looked very smart as being on a black motor.
I also thought it maybe illegal, so i checked and found the following info.
Older plates had white, Grey or silver characters on a black background. This style of plate was phased out in 1972, and is now legal to be carried only on vehicles built prior to 1 January 1973.
Front number plates are 520 mm x 111 mm (20.5" x 4 3/8") in size. Rear plates may be 520 mm x 111 mm (Standard), 285 mm x 203 mm (Square), 533 mm x 152 mm (large).
So it looks like the mod is a no go then.
I don't think the Audi driver will have it like that for long.
But i think it still looked real smart.