(1)A major precepting authority which has made calculations in accordance with sections 43 to 48 above in relation to a financial year (originally or by way of substitute) may make calculations in substitution in relation to the year in accordance with those sections.
(2)None of the substitute calculations shall have any effect if—
(a)the amount calculated under section 43(4) above, or any amount calculated under section 44(1) or 45(2) or (3) above as the basic amount of council tax applicable to any dwelling, would exceed that so calculated in the previous calculations; or
(b)the authority fails to comply with subsection (3) below in making the substitute calculations.
(3)In making substitute calculations under section 44(1) or 45(3) above, the authority must use any amount determined in the previous calculations for item P or T in section 44(1) above or item TP in section 45(3) above.
(4)For the purposes of subsection (3) above, the authority may treat any amount determined in the previous calculations for item P in section 44(1) above as increased by the amount of any sum which—
(a)it estimates will be payable to it for the year in respect of additional grant; and
(b)was not taken into account by it in making those calculations.
(5)Subsections (2) and (3) above shall not apply if the previous calculations have been quashed because of a failure to comply with sections 43 to 48 above in making the calculations.