What????? There are a few cars that have that like F40's and some older cars.
It's acceptable as long as it's the right colour and the letters/numbers are the right size , spacing and font.
In the UK if you alter the plates numbers or letters in any way you will get 3 points off your licence and a hefty fine. You are allowed to make the plate smaller as long as you respect the requirements for the letters/numbers.
If you don't display a front plate you could get a fine of £40 or £60 pounds ( I should remember as I got one...) but no points