4. The following provisions of the 2016 Act come into force on 1st April 2022—
(a)section 16 (Certification Officer not subject to ministerial direction);
(b)section 17 (Investigatory powers etc), to the extent that it is not then already in force;
(c)section 19 (Further powers of Certification Officer where enforcement order made), to the extent that it is not then already in force;
(d)section 21 (Rights of appeal not limited to questions of law);
(e)section 22 (Minor and consequential amendments), to the extent that it is not then already in force.