The police authority for any police area may enter into an agreement with the occupier of any premises or land in the area, on such terms as may be specified in the agreement, for the guarding, patrolling and watching of the premises or land by constables of the police force maintained for the area.

The power conferred upon a police authority by subsection (1) of this section may be delegated by them, subject to such limitations and conditions as may be specified in the delegation, to the chief constable of the police force.