22.—(1) It shall be the duty of the IPCC in the case of every complaint referred to it by the relevant appropriate authority, to determine whether or not it is necessary for the complaint to be investigated.
(2) Where the IPCC determines under this regulation that it is not necessary for a complaint to be investigated, it may, if it thinks fit, refer the complaint back to the relevant appropriate authority in accordance with paragraph (3).
(3) In a case to which paragraph (2) applies the relevant appropriate authority shall not be required by virtue of any provisions of these Regulations to take any action in relation to the complaint but may handle the complaint in whatever manner it thinks fit, or take no action in relation to the complaint.
(4) Where the IPCC refers a complaint back under paragraph (2), it shall give a notification of the making of the reference back—
(a)to the complainant, and
(b)to the person complained against.