Yes Craig, you can reduce overall size like yours is, I mistakenly put 10mm but should be 11mm 'officially', although I doubt they would measure it that accurately at the roadside if stopped to + or - 1mm
I have "German Style" pressed metal plates, in the modern colours. As my Registration is only 6 characters, including the space, the plates are shorter.
The producer assured me that are 100% legal as the gap between each letter/number and the black edge of the plate is exactly as specified, as is the font. top and bottom.
When I called them told me that if I had a single Letter-Number registration, for example "A1" the number plate could be very small!!
