4(1)A charging scheme may—
(a)specify the amount of a charge or a scale of charges by reference to which the amount is to be ascertained, or
(b)provide that a charge is to be of an amount determined by the scheme or by the charging authority under the scheme.
(2)A charging scheme may provide that the charge for the performance of a particular function must not exceed an amount specified in the scheme.
(3)A charging scheme may specify factors to which the charging authority may or must have regard when ascertaining or determining the amount of a particular charge.
(4)A charging scheme may, in relation to each charge specified in it, specify—
(a)the manner in which the charge is to be paid;
(b)the time at which the charge is to be paid;
(c)the person by whom the charge is to be paid.
(5)A charging scheme may specify different charges for different cases.