Hairy said:
My plate only has 5 characters, not the normal 7, so I could keep the correct spacing on a shorter plate if I was allowed a shorter plate.
This is perfectly legal to do.
My plate has only 5 characters, so a full length plate looks a bit daft with all the blank space on them
I cut mine down, according to the regulations. The relevant one states:
Top, bottom and side margins (minimum) 11mm
As long as the typeface is the legal size, and you leave the 11mm gap to the edge of the plate, they are perfectly legal.
Mine has just passed it's MOT with them on.