19. The Welsh Ministers must review the need for the requirements imposed by these Regulations, and whether those requirements are proportionate to what the Welsh Ministers seek to achieve by them—
(a)by 29th June 2020,
(b)at least once in the period of 21 days beginning with the day after that date, and
(c)at least once in every subsequent period of 21 days.
20.—(1) These Regulations expire at the end of the period of 12 months beginning with the day on which they come into force.
(2) The expiry of these Regulations does not affect the validity of anything done pursuant to these Regulations before they expire.