# The Air Navigation Order 1995, Paragraph 3


Width, Spacing and Thickness of Marks
(1) For the purposes of this paragraph:
(a) “standard letter” shall mean any letter other than the letters, I, M and W;
(b) the width of each standard letter and the length of the hyphen between the nationality mark and the registration mark shall be two-thirds of the height of a letter;
(c) the width of the letters M and W shall be neither less than two-thirds of their height nor more than their height; and
(d) the width of the letter I shall be one-sixth of the height of the letter.
(2) The thickness of the lines comprising each letter and hyphen shall be one-sixth of the height of the letters forming the marks.
(3) Each letter and hyphen shall be separated from the letter or hyphen which it immediately precedes or follows, by a space equal to either one-quarter or one-half of the width of a standard letter. Each such space shall be equal to every other such space within the marks.

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Source: https://www.legislation.gov.uk/uksi/1995/1038/schedule/1/part/B/paragraph/3 (the official version)
Page: https://openlegislation.uk/air-navigation-order-1995/schedule-1/part-B/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.