Paragraph 19
Subject to sub-paragraph (5), in the case of an applicant—
who claims to be a British citizen;
who does not currently hold a valid United Kingdom passport describing the applicant as a British citizen;
who was not born or adopted in the United Kingdom;
who was born on or after 1st January 1983;
who has not been issued with a certificate of registration or naturalisation; and
who is not a citizen of a British Overseas Territory;
the documents specified in paragraph (2), and either one of the documents specified in paragraph (3), or one of the documents specified in paragraph (4), together with the applicant’s parents’ marriage certificate.
The documents specified are –
the applicant’s birth certificate in a form which contains details of the parents of the applicant, in so far as they are included on the relevant register; and
the passport on which the applicant first entered the United Kingdom.
The documents specified are –
the applicant’s mother’s United Kingdom birth certificate;
the applicant’s mother’s certificate of registration or naturalisation; and
the applicant’s mother’s passport, describing her as either a British citizen or a British subject (Citizen of the United Kingdom and Colonies), valid at the time of the applicant’s birth.
The documents specified are –
the applicant’s father’s United Kingdom birth certificate;
the applicant’s father’s certificate of registration or naturalisation; and
the applicant’s father’s passport, describing him as either a British citizen or a British subject (Citizen of the United Kingdom and Colonies), valid at the time of the applicant’s birth.
Where an applicant provides a birth certificate issued by a British consulate or High Commission overseas, references in this paragraph to documents specified in sub-paragraphs (2) to (4) do not apply.