21.—(1) A local authority shall pay to the police authority for the police area in which the alcohol disorder zone is situated the costs incurred by that authority in the provision of chargeable non-baseline services by the chief officer of police calculated in accordance with regulation 15.
(2) A local authority shall pay to the British Transport Police Authority the costs incurred by that Authority in the provision of chargeable non-baseline services by the British Transport Police calculated in accordance with regulation 15.