Cronos

Not strictly true, the rule on numberplates actually relates to the size of letters and spacing. For most 7 character plates a 9" x 7" is generally the minimum. Bit if the plate contained a number of 1s then the plate size could be reduced as the character 1 takes up less space than all the other characters e.g. A111 ABC. I believe all the other characters are the same size.

If you get into the realm of 6 character number plates then 7" x 6.5" would cover most bases. From memory justmacsv650 has a pretty small, but perfectly legal plate because he's got a personalised reg.

So I guess the smallest legal plate would be any two character plate with 1 in it. Something like A1 for example would be a pretty small plate, but cost about 20 times as much as the SV!