These Regulations are made in exercise of the powers in sections 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)(a), 8(2)(c) and 8(3)(a)) arising from the withdrawal of the United Kingdom from the European Union.
Link: The Provision of Services (Amendment etc.) (EU Exit) Regulations 2018
Source: Legislation .gov.uk
