90(1)In subsection (1) of section 143 of that Act (power to alter contributions with a view to adjusting level of National Insurance Fund), for paragraphs (a) and (b) there shall be substituted the following paragraphs—
“(a)the percentage rate specified as the primary percentage in section 8(2);
(b)the percentage rate specified as the secondary percentage in section 9(2);”.
(2)In subsection (4) of that section, for paragraph (a) there shall be substituted the following paragraph—
“(a)to increase for any tax year the primary percentage, or the secondary percentage, to a percentage rate more than 0.25 per cent higher than that applicable at the end of the preceding tax year;”.