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)(a), (d), (e) and (g)) arising from the withdrawal of the United Kingdom from the European Union. Regulation 1(4) to (6) is made in exercise of the power in paragraph 21 of Schedule 7 to that Act.
Link: The Motor Vehicles (Compulsory Insurance) (Amendment etc.) (EU Exit) Regulations 2019
Source: Legislation .gov.uk