Re front number plates on an M3W in the UK. I used to run without one , then was pulled up at MOT time as the car is a MOT class 4 ( exceeds the weight for class 3 by quite a margin ) so needs a front plate. So my understanding is it is a legal requirement to display one at the front ? ... at MOT time for sure 
M3W5sp 2015, MSCC, MTWC, Oxon UK
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