37In section 41 of that Act (reduced rates of Class 1 contributions)—
(a)in subsection (1) (earnings relevant for subsections (1A) and (1B) limited by upper earnings limit) for “the current upper earnings limit” substitute “the applicable limit”;
(b)after that subsection insert—
“(1ZA)In subsection (1)—
(a)“the applicable limit”—
(i)in relation to a tax week falling in a tax year before the flat rate introduction year, means the upper earnings limit for the week in question;
(ii)in relation to a tax week falling in the flat rate introduction year or any subsequent tax year, means the upper accrual point divided by 52; and
(b)“prescribed”—
(i)in relation to the lower or upper earnings limit, means (in accordance with section 5(4) of the Social Security Contributions and Benefits Act 1992) prescribed under that provision;
(ii)in relation to the amount mentioned in paragraph (a)(ii) above, means (in accordance with section 181) prescribed by regulations under this Act.”