(1)Contributions under section 16 shall be levied by means of one or more schemes made by the Secretary of State, referred to in this section as " charging schemes ".
(2)A charging scheme shall be made by statutory instrument which shall be subject to annulment in pursuance of a resolution of either House of Parliament.
(3)A charging scheme may apply to all harbour authorities, subject to subsection (4), to harbour authorities of a particular class or to particular harbour authorities, and may make provision for levying different contributions from different harbour authorities to whom it applies.
(4)No contribution shall be levied from a harbour authority under a charging scheme if the only harbour being improved, maintained or managed by them is a fishery harbour or marine work within the meaning of the [1964 c. 40.] Harbours Act 1964.
(5)The provisions of Part II of Schedule 5 have effect with respect to charging schemes.