Paragraph 4
The background of any mark (other than an embossed mark) shall be plain white, the line delineating the rectangle shall be black, and all writing thereon shall be:—
(a)
lack and clearly legible, and
(b)
iform size of type, which shall not be less than 1.5 mm capital height, except for the words “MPT 1322” which shall be in bold capitals of a height of not less than 2.5 mm.