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(4) An officer of any rank may perform the functions of a custody officer at a designated police station if a custody officer is not readily available to perform them.

(5) Subject to the following provisions of this section and to section 39(2) below, none of the functions of a custody officer in relation to a person shall be performed by an officer who at the time when the function falls to be performed is involved in the investigation of an offence for which that person is in police detention at that time.

(6) Nothing in subsection (5) above is to be taken to prevent a custody officer—
 * (a) performing any function assigned to custody officers—
 * (i) by this Act; or
 * (ii) by a code of practice issued under this Act;
 * (b) carrying out the duty imposed on custody officers by section 39 below;
 * (c) doing anything in connection with the identification of a suspect; or
 * (d) doing anything under section 8 of the Road Traffic Act 1972.

(7) Where an arrested person is taken to a police station which is not a designated police station, the functions in relation to him which at a designated police station would be the functions of a custody officer shall be performed—
 * (a) by an officer who is not involved in the investigation of an offence for which he is in police detention, if such an officer is readily available; and
 * (b) if no such officer is readily available, by the officer who took him to the station or any other officer.

(8) References to a custody officer in the following provisions of this Act include references to an officer other than a custody officer who is performing the functions of a custody officer by virtue of subsection (4) or (7) above.

(9) Where by virtue of subsection (7) above an officer of a force maintained by a police authority who took an arrested person to a police station is to perform the functions of a custody officer in relation to him, the officer shall inform an officer who—
 * (a) is attached to a designated police station; and
 * (b) is of at least the rank of inspector,

that he is to do so.

(10) The duty imposed by subsection (9) above shall be performed as soon as it is practicable to perform it. B3