5.—(1) The amount to be levied by the Greater Manchester Waste Disposal Authority in respect of any year from the council of the metropolitan district of Wigan shall not include any amount relating to the Authority’s waste disposal functions and, accordingly, that amount shall be borne by the other constituent councils of the Authority in such proportions as they may agree or, in default of agreement, in the proportions specified in regulation 4(1)(b).
(2) In this regulation, “waste disposal functions” means functions vested in the Greater Manchester Waste Disposal Authority by virtue of regulation 5 of, and Schedule 2 to, the 1985 Order which are not exercisable by the Authority in the metropolitan district of Wigan.