(1) This section applies to any dispute about the reasonableness of the costs that are incurred, or claimed to have been incurred, in the performance of the duties imposed by this Act that arises between,—
(a) in the case of costs under sections 16 and 17, the Crown and a network operator; or
(b) in the case of costs under section 18, a surveillance agency and a network operator or a service provider.
(2) If a dispute to which this section applies is unable to be resolved by agreement between the parties, the dispute must be referred to—
(a) mediation; or
(b) if the parties are unable to resolve the dispute at mediation, arbitration.
(3) If a dispute is referred to arbitration under subsection (2)(b), the provisions of the Arbitration Act 1996 apply to that dispute.