(1) An improvement notice given by a police officer may only be cancelled by—
(a) the officer; or
(b) a police officer who is senior in rank to the person who gave the notice; or
(c) the chief police officer.
(2) An improvement notice given by an authorised person other than a police officer may only be cancelled by—
(a) the person; or
(b) the appointing competent authority.
(3) Written notice of the cancellation of an improvement notice must be given to the person to whom the improvement notice was given.