entitled personmeans any person who is neither a United Kingdom national nor a permanent resident of the United Kingdom and: (a) who enjoys any privilege or immunity by virtue of that person being – (i) a diplomatic agent for the purposes of the Diplomatic Privileges Act 1964, (ii) a senior officer of the Commonwealth Secretariat for the purposes of the Commonwealth Secretariat Act 1966, (iii) a consular officer for the purposes of the Consular Relations Act 1968, (iv) a representative or a person recognised as holding a rank equivalent to a diplomatic agent for the purposes of the International Organisations Act 1968, or (b) whose circumstances, at the time the duty or tax in respect of