There are rules governing the size and position of the number plate, text font etc and I've heard of a few people falling foul of over exuberant traffic wardens and there interpretation of the regulations.
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from the DVLA website
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The police can issue fixed penalty fines for illegally displayed number plates.
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Offenders could face a maximum fine of
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£1,000 and in some cases the number plate may be withdrawn.
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Vehicles with illegally displayed number plates may fail the MOT test.
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Also, the characters on a number plate need to be a standard height and width.
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Your number plate should show the correct:
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character height
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- 79 millimetres
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character width
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- 50 millimetres
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(except the figure 1 or letter I)
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character stroke
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- 14 millimetres
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space between characters
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- 11 millimetres
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space between groups
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- 33 millimetres
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top, bottom and side margins
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- minimum 11 millimetres
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space between vertical lines
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- 19 millimetres
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AFAIK if it possible to display your number plate in the centre of the car then that's where it has to go.
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HTH
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Alan