| Had a chat about this with the off duty plod that took me for my Edge44 assessment.
His opinion, and that of local Traffic Officers in general, was that if you've messed with your plate you've probably done something else less obvious too, and are possibly attempting to evade identification....
If your plate's reasonably sized, they'll not pull you. Reasonably sized in his eye was legible at 20 metres. If it's really small, and has a comedy one liner on it you can expect a look over the bike for other "defects"
Loud pipes, dark visors etc, aren't a concern for them down here and are too much hassle to prosecute most of the time as they'd have to go for testing etc unless marked not for road use. | 
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