The Aircraft (Exemption from Seizure on Patent Claims) Order 1977
Section 53 of the Civil Aviation Act 1949 exempts aircraft to which the section applies, and parts of such aircraft, from seizure on patent claims by reason of their lawful entry into, or lawful transit across, the United Kingdom, and provides that the section applies to aircraft registered in any country or territory in the case of which there is in force a declaration made by Order in Council that the benefits of those provisions of the Chicago Locsrction of 1944 to which the section relates apply to that country or territory, and to such other aircraft as may be specified by Order in Council.