4(1)Where for any year the actual rent income of a county council or town council is less than the council's notional rent income, the relevant local expenditure of the council shall be calculated for the purposes of this Part of this Schedule as if the council's notional rent income were substituted for the council's actual rent income.
(2)In this paragraph " actual rent income " has the same meaning as in section 3(3)(a) of the Act of 1963, and the notional rent income of a council shall be calculated on such basis as may be prescribed.