(1) Where a chief officer makes a collaboration agreement, the policing body responsible for maintaining the force shall hold the chief officer to account for the discharge of functions by anyone who—
(a) is acting under the terms of the agreement, and
(b) while so acting, is under the direction and control of the chief officer.
(2) Before making a collaboration agreement to which a chief officer of police is to be a party, a policing body must notify the chief officer of the arrangements that it proposes to make for the discharge of its functions under this section in connection with the agreement.
(3) When deciding what arrangements to make, the policing body shall, in particular, make arrangements for those functions to be discharged jointly with another policing body responsible for maintaining a force whose chief officer is a party to the agreement.
(4) The functions conferred on a policing body under this section do not affect any other function of holding a chief officer to account.