For the purposes of sections 221 and 222, in arriving at the average hourly rate of remuneration, only—
the hours when the employee was working, and
the remuneration payable for, or apportionable to, those hours,
shall be brought in.
If for any of the twelve weeks mentioned in sections 221 and 222 no remuneration within subsection (1)(b) was payable by the employer to the employee, account shall be taken of remuneration in earlier weeks so as to bring up to twelve the number of weeks of which account is taken.
Where—
in arriving at the average hourly rate of remuneration, account has to be taken of remuneration payable for, or apportionable to, work done in hours other than normal working hours, and
the amount of that remuneration was greater than it would have been if the work had been done in normal working hours (or, in a case within section 234(3), in normal working hours falling within the number of hours without overtime),
account shall be taken of that remuneration as if the work had been done in such hours and the amount of that remuneration had been reduced accordingly.