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UK – EU Transition, and UK Civil Aviation Regulations

To access current UK civil aviation regulations, including AMC and GM, CAA regulatory documents, please use this link to UK Regulation. Please note, if you use information and guidance under the Headings below, the references to EU regulations or EU websites in our guidance will not be an accurate information or description of your obligations under UK law. These pages are undergoing reviews and updates.

Display of nationality and registration marks

UK-registered aircraft are required by law to bear nationality and registration marks. There are a small number of exceptions to this (see below).

For full information and guidance see our publication CAP 523: Display of Nationality & Registration Marks on Aircraft.


The aim of registration marks is to enable an observer to readily identify the aircraft, and as such they should be displayed clearly and to the best advantage, all in one colour which contrasts with the background. Marks must be of a specified size, as set out in CAP 523.


To check if a particular registration mark is available and to get further details on the policy regarding the issue of registration marks please see Availability and Reservation of UK Registration Marks.


There are two highly specific exemptions from the requirement to bear nationality and registration marks: they may be granted for specific filming work and for historically accurate military liveries.

See our guidance on exemptions for more details.

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