These Regulations are made in exercise of the powers conferred by the European Union (Withdrawal) Act 2018 (c.16) (in particular under sections 8(2)(a) and (d) of that Act) in order to address failures of retained EU legislation to operate effectively and other deficiencies arising from the withdrawal of the United Kingdom from the European Union.
Link: The Competitiveness of Enterprises and Small and Medium-Sized Enterprises (Revocation) (EU Exit) Regulations 2019
Source: Legislation .gov.uk