3.—(1) Subject to paragraph (2), in relation to any period of self-isolation specified under the Self-Isolation Regulations which begins before the coming into force of the amendments made by regulation 2 of these regulations, the Self-Isolation Regulations apply as if those amendments had not been made.
(2) Where a period of self-isolation calculated in accordance with regulation 3(4) of the Self-Isolation Regulations began before the commencement date and had not ended when these regulations come into force, the period ends with the later of—
(a)the tenth day of that period; or
(b)the commencement date.
(3) In calculating whether the tenth day of a period of self-isolation has been reached for the purposes of paragraph (2), the period is to be treated as having begun the day after the day on which it originally began.