its nothing to do with import or not - its to do with the uk regs - letter, number spacing and font size which gives overall size and... what the mot person will pass which is based on what they can clearly read at a set distance whcih gives you angle options on the positioning hence means ST's passes the MOT because it is clear and legible from where the person stands to read it.
dibble can confiscate the plate and go through the usual stuff, produce docs, non endorsable fine etc but I believe the worst you can be hammered with is attempting to pervert the course of justice but that tends to be micro or missing plates on top of you doing something else really bad which they may or may not have got evidence of you committing but they want to get you on something