Section 3 of BNA 1981 wrote:3 Acquisition by registration: minors.
(1)If while a person is a minor an application is made for his registration as a British citizen, the Secretary of State may, if he thinks fit, cause him to be registered as such a citizen.
(2)A person born outside the United Kingdom [F1and the qualifying territories] shall be entitled, on an application for his registration as a British citizen made [F2while he is a minor], to be registered as such a citizen if the requirements specified in subsection (3) or, in the case of a person born stateless, the requirements specified in paragraphs (a) and (b) of that subsection, are fulfilled in the case of either that person’s father or his mother (“the parent in question”).
(3)The requirements referred to in subsection (2) are—
(a)that the parent in question was a British citizen by descent at the time of the birth; and
(b)that the father or mother of the parent in question—
(i)was a British citizen otherwise than by descent at the time of the birth of the parent in question; or
(ii)became a British citizen otherwise than by descent at commencement, or would have become such a citizen otherwise than by descent at commencement but for his or her death; and
(c)that, as regards some period of three years ending with a date not later than the date of the birth—
(i)the parent in question was in the United Kingdom [F3or a qualifying territory] at the beginning of that period; and
(ii)the number of days on which the parent in question was absent from the United Kingdom [F4and the qualifying territories] in that period does not exceed 270.
