These Regulations are made in exercise of the powers in section 8(1) of the European Union (Withdrawal) Act 2018 (c. 16) to address failures of retained EU law to operate effectively and other deficiencies (in particular under section 8(2)(a), (b), (c), (d) and (g)) arising from the withdrawal of the United Kingdom from the European Union.
Link: The European Structural and Investment Funds Common Provisions (Amendment) (EU Exit) Regulations 2019
Source: Legislation .gov.uk