These Regulations are made in exercise of the powers in section 8 of, and paragraph 21 of Schedule 7 to, the European Union (Withdrawal) Act 2018 in order to address failures of retained EU law to operate effectively in England and Wales and Northern Ireland and other deficiencies arising from the withdrawal of the United Kingdom from the European Union (and in particular, the deficiencies under paragraphs (c), (d) and (g) of section 8(2) and paragraph (a) of section 8(3)).
Link: The Civil Partnership and Marriage (Same Sex Couples) (Jurisdiction and Judgments) (Amendment etc.) (EU Exit) Regulations 2019
Source: Legislation .gov.uk