Where in relation to a financial year an authority to which section 31A, 32, 42A or 43 of the Local Government Finance Act 1992 (billing or major precepting authority) applies has made the calculations required by that section, it must review them from time to time during the year.
In carrying out a review under subsection (1), an authority must use the same figures for financial reserves as those used in the calculations under review, except in the case of financial reserves to meet a revenue account deficit from an earlier financial year.
If as a result of carrying out a review under subsection (1) it appears to the authority that carried out the review that there has been a deterioration in its financial position, it must take such action, if any, as it considers necessary to deal with the situation.
For the purposes of subsection (3), there is a deterioration in an authority's financial position if on the review an amount falls to be calculated under section 31A(4), 32(4), 42A(4) or 43(4) of the Local Government Finance Act 1992 (c. 14) (council tax or budget requirement) and—
Where substitute calculations have effect, it is those calculations to which the duty under subsection (1) applies.