4. The amendment made by regulation 2 does not apply in respect of a pay reference period(1) which begins before 1st April 2016.
Section 1(4) of the National Minimum Wage Act 1998 provides that a “pay reference period” is such period as the Secretary of State may prescribe. “Pay reference period” has the meaning assigned to it by regulation 6 of the National Minimum Wage Regulations 2015 (S.I. 2015/621).