20.—(1) Subject to subsection (3), references in this Part to a capital receipt, in relation to a council, are to a sum received by the council in respect of the disposal by it of an interest in a capital asset.
(2) An asset is a capital asset for the purposes of subsection (1) if, at the time of the disposal, expenditure on the acquisition of the asset would be capital expenditure.
(3) Regulations may—
(a)make provision for the whole of a sum received by a council in respect of the disposal by it of an interest in a capital asset, or such part of such a sum as may be determined under the regulations, to be treated as not being a capital receipt for the purposes of this Part;
(b)make provision for the whole of a sum received by a council otherwise than in respect of the disposal by it of an interest in a capital asset, or such part of such a sum as may be determined under the regulations, to be treated as being a capital receipt for the purposes of this Part.
(4) Where a sum becomes payable to a council before it is actually received by the council, it shall be treated for the purposes of this section as received by the council when it becomes payable to the council.