Rules made under section 53 of this Act may—
regulate the manner in which chief officers of police are to carry out their duties under this Act;
enable all or any of the functions of a chief officer of police to be discharged by a deputy in the event of his illness or absence, or of a vacancy in the office of chief officer of police.
Without prejudice to subsection (1)(b) of this section, the functions of a chief officer of police under this Act shall be exercisable on any occasion by a person, or a person of a particular class, authorised by the chief officer of police to exercise that function on that occasion, or on occasions of that class or on all occasions.