Section 50(9A) of the British Nationality Act 1981 (c. 61) establishes that, for the purposes of that Act, a child’s father is (a) the husband, at the time of the child’s birth, of the woman who gave birth to the child, or (b) a person who is treated as the father of the child under section 28 of the Human Fertilisation and Embryology Act 1990 (c. 37) or section 35 or 36 of the Human Fertilisation and Embryology Act 2008 (c. 22), or (ba) a person who is treated as a parent of the child under section 42 or 43 of the Human Fertilisation and Embryology Act 2008, or (c) where none of those paragraphs applies, any person who satisfies prescribed requirements as to proof of paternity. The British Nationality (Proof of Paternity) Regulations 2006 (“the 2006 Regulations”) (S.I. 2006/1496) prescribe requirements as to proof of paternity for the purposes of section 50(9A)(c) of the British Nationality Act 1981.