On any appeal under section 122 or 126(1) above conditions providing for the payment of charges to the sewerage undertaker in question shall not be determined by the Authority except in so far as no provision is in force by virtue of a charges scheme under section 143 below in respect of any such receptions, discharges, removals or disposals of effluent or substances as are of the same description as the reception, discharge, removal or disposal which is the subject-matter of the appeal.
In so far as any such conditions as are mentioned in subsection (1) above do fall to be determined by the Authority, they shall be determined having regard to the desirability of that undertaker's—
To the extent that subsection (1) above excludes any charges from a determination on an appeal those charges shall be fixed from time to time by a charges scheme under section 143 below but not otherwise.