6For the purposes of this Part of this Schedule, the expenditure of a local authority other than a county council and the Greater London Council shall be so much of the total expenditure of the authority for the year in question as would have fallen to be met out of rates levied within the area of the authority if no resources element were payable and, in the case of a local authority in Greater London, section 66 of the [1963 c. 33.] London Government Act 1963 (which provides for schemes for equalising rates) had not been passed, excluding the cost of the collection of rates as ascertained in accordance with rules under section 25 of this Act.