5. Any statement required by the preceding paragraph shall be clear and legible and the figures and the letters in any such statement–
(a)shall be in characters of uniform colour and size and not less than 3 millimetres in height, but so that the initial letter of any word may be taller than any other letter in the word;
(b)shall appear on a contrasting ground;
(c)shall be within a surrounding line and no other written or pictorial matter shall appear within that line.