Demand notices: final adjustment
54. Subject to article 73, an authority may authorise a contractor to exercise the functions—
(a)after the expiry of a chargeable financial year or part of a chargeable financial year for which an amount is payable in relation to a hereditament by way of non-domestic rate, of preparing and serving a further notice on the ratepayer concerned stating the amount payable for the year or part in relation to the hereditament and adjusting the amounts required to be paid; and
(b)where there has been an overpayment in respect of the ratepayer’s liability under Part II of the Regulations, of repaying the amount overpaid or crediting it against any subsequent liability of the ratepayer to pay anything by way of non-domestic rate.