These Regulations are made in exercise of the powers in section 8(1) of the European Union (Withdrawal) Act 2018 (c. 16) in order to address failures of retained EU law to operate effectively and other deficiencies (in particular under section 8(2)(e)) arising from the withdrawal of the United Kingdom from the European Union.
Link: The International Recovery of Maintenance (Hague Convention on the International Recovery of Child Support and Other Forms of Family Maintenance 2007) (EU Exit) Regulations 2018
Source: Legislation .gov.uk
