A person is entitled to be registered as a British citizen if—
The first condition is that the applicant was born . . . before 1st January 1983.
The second condition is that the applicant would at some time before 1st January 1983 have become a citizen of the United Kingdom and Colonies—
Assumption A is that—
Assumption B is that—
For the purposes of subsection (3B), a nationality status is acquired by a person (“P”) by descent where its acquisition—
In determining for the purposes of subsection (3) whether a person would have been a citizen of the United Kingdom and Colonies, the requirement that a person’s birth was registered at a United Kingdom consulate, as set out in section 5(1)(b) of the British Nationality Act 1948, is to be ignored.
The third condition is that immediately before 1st January 1983 the applicant would have had the right of abode in the United Kingdom by virtue of section 2 of the Immigration Act 1971 (c. 77) had he become a citizen of the United Kingdom and Colonies as described in subsection (3) above.
For the purposes of the interpretation of section 5 of the 1948 Act in its application in the case of assumption A to a case of descent from a mother, the reference in the proviso to subsection (1) of that section to “a citizen of the United Kingdom and Colonies by descent only” includes a reference to a female person who became a citizen of the United Kingdom and Colonies by virtue of—