This section applies if the Secretary of State gives a direction under section 52ZR above to a billing authority.
The direction must state the amount that is to be the amount of the billing authority's council tax requirement for the financial year.
If the direction is given before the billing authority has carried out its council tax calculations for the financial year, that amount is to be treated for all purposes as the amount calculated by the billing authority under section 31A above.
If the direction is given after the billing authority has carried out its council tax calculations for the financial year (whether or not it has set an amount of council tax for the year)—
For the purposes of those and any subsequent substitute calculations and the application of Chapter 3 above to them—