Numberplate spray

plus if the cops are behind you at night, they'll see the increased reflectivity and may pull you and give you points etc.

better off with a road angel type product.
 
"LEGAL

The law states that you can not obscure your number plate. Photoblocker does not obscure or interfere with the reflective background of your number plate. Therefore it is perfectly legal to use on your car.
"
They can still have you for obstruction of justice.
 
Here the number plate accidently falls off and is displayed in the rear window (on the back ledge where no camera will ever flash it...). Blissfully no points system yet, only a maximum UKP40 fine if the copper is in a bad mood. Beats a UKP2000 fine if you're caught speeding at some insane speed... :))
 
Or you could just take your plates off. Failure to display, no points, 30 quid fine! Or covered them in mud, leaves, newspaper, bit of cardboard, again failure to display, same again.
 
saw that spry at a show and a mate tried to take a photo of the number plate, not surprisingly tye sales mad hid it from the camera !!!!!
 
I saw a program once where they tested it, the pic did indeed show a bright flash from the plate. I don't know if it was true but they showed the pic on a computer being put through a "negative" filter using a program such as paintshop. The number could then easily be read.

Kev.