# The Air Navigation Order 1989, Paragraph 1


The nationality mark of the aircraft shall be the capital letter “G” in Roman character and the registration mark shall be a group of four capital letters in Roman character assigned by the Authority on the registration of the aircraft. The letters shall be without ornamentation and a hyphen shall be placed between the nationality mark and the registration mark.

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Source: https://www.legislation.gov.uk/uksi/1989/2004/schedule/1/part/B/paragraph/1 (the official version)
Page: https://openlegislation.uk/air-navigation-order-1989/schedule-1/part-B/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.