These Regulations correct an error in the commencement provisions of the Health Protection (Coronavirus, Restrictions) (Self-Isolation) (England) (Amendment) Regulations 2021. The effect is to ensure that the amendment made by regulation 2(2)(a) of those Regulations (which provides that the exemption from the duty to self-isolate for the purpose of posting Coronavirus tests is extended to include tests for antibodies) comes into force on 19th July 2021.