I didnt bother with a front number plate for about four years, I kept blagging it, then when I couldnt overturn a ticket I put an import sized one on, but then half a year later another county told me it was illegal so i took it off and never bothered with one after that I just sold the car...
This is from the DVLAs' website -
Display of Vehicle Registration Marks on Imported Vehicles (which have a restricted space for a standard sized number plate)Certain imported vehicles may be permitted to display number plates with smaller characters if:The vehicle does not have European Community Whole Vehicle Type ApprovalAND
l The vehicle's construction/design cannot accomodate standard size number platesSpecifications for smaller sized plates (for certain imported vehicles)
Character Height
64mm
Character Width
44mm
Character Stroke
10mm
Space between characters
10mm