As you can imagine there is a lot of discussion on plates within the M/c fraternity.
Motor Cycle News the weekly auricle asked for a Gov ruling - the answer was...if u get stopped for an infringement and the plate is not legal u will get told to change it and take to an MOT station within a week for verification.BUT it would be v unlikely that u would get stopped for a plate infringement itself.I have seen Silver letters/numbers on a black background on new bikes - and they do look good - say on a Bonneville - but IMHO this would be pushing it if it was done on an M3W - tempting as it seems!! Both are illegal bike or M3