退一步搵下英聯邦國家護照 - BN(O) passport is also a Commonwealth passport according to section 37(1)(a) of the British Nationality Act 1981 -
37 Commonwealth citizenship.
(1)
Every person who—
(a)under the British Nationality Acts 1981 and 1983 or the British Overseas Territories Act 2002 is a British citizen, a British overseas territories citizen,
a British National (Overseas), a British Overseas citizen or a British subject; or
(b)under any enactment for the time being in force in any country mentioned in Schedule 3 is a citizen of that country,
shall have the status of a Commonwealth citizen.
https://www.legislation.gov.uk/ukpga/1981/61