These Regulations amend Regulation (EU) 2019/1242 of the European Parliament and of the Council of 20 June 2019 which sets emissions performance standards for new heavy-duty vehicles (the “HDV Regulation”) as previously amended by the New Heavy Duty Vehicles (Carbon Dioxide Emission Performance Standards) (Amendment) (EU Exit) Regulations 2020 (S.I. 2020/1402) and the Road Vehicle Carbon Dioxide Emission Performance Standards (Cars, Vans and Heavy Duty Vehicles) (Amendment) Regulations 2022 (S.I. 2022/1361). They also amend Commission Implementing Regulation (EU) 2020/1079 of 20 July 2020 on the verification and correction of data referred to in Regulation (EU) 2018/956 on the monitoring and reporting of CO2 emissions from and fuel consumption of new heavy-duty vehicles (“the Data Regulation”). The HDV Regulation and the Data Regulation are secondary assimilated law within the meaning of section 11(2)(a) of the Retained EU Law (Revocation and Reform) Act 2023 (c. 28) read with section 5(1) of that Act.