3As regards a designated authority the relevant amount is an amount equal to the level—
(a)determined under section 3(1) of the [1984 c. 33.] Rates Act 1984 (expenditure levels) as the level for the authority’s total expenditure in the year beginning in 1989, and
(b)stated in a notice served on the authority under section 3(3) of that Act and dated 7 July 1988.