thats happened to me twice - mainly because the rear number plate has no spacing, i'll put my hand upto it being illegal though. What i didn't realise is that if you have a standard govt issued registration with no spacing (as a lot of them have) then it's fine.
But pay the govt lots of money for a registration then suddenly theres a problem.
Also i've been stopped for other things in the past and the reg has been completely ignored.
One of those 'officers discretion' things!!
E92 320D MS Ti CR