The Secretary of State shall, upon the best information available to him, estimate and notify each local authority the amounts of domestic rate relief garnt and block grant which will become payable to the authority for a year; and he may make and notify to an authority such further estimates of teh said amounts, taking in to account information not previously available, as he may think fit.

As soon as practicable after he has received what appears to him to be sufficient information for the purpose, the Secretary of State shall make a conclusive calculation if the said amounts and notify the result of that calculation to each local authority.

The amounts of domestic rate relief grant and block grant payable to a local authority shall each be calculated to the nearest pound.

Where it appears to the Secretary of State from any estimate or calculation made under this section that sum in excess of the amount of the estimate or calculation has already been paid to a local authority in respect of rate support grants for the year, he may recover that sum by deduction from any amount due to that authority in respect of those grants, whether for the year or for any subsequent year, or by issuing a demand for it to the authority or partly by such deduction and partly by such a demand, as he thinks fit.