153.—(1) The F228[chief executive] for a local authority—

(a) shall act for and on behalf of the local authority in every action or other legal proceeding whether civil or criminal, instituted by or against the local authority, and

(b) may do all such acts, matters, and things as he or she may consider necessary for the preparation and prosecution or defence of such action or other proceeding in the same manner in all respects as if (as the case may require) he or she were the plaintiff, prosecutor, defendant or other party to that action or other proceeding.

(2) Where an action or other proceeding relates to the exercise or performance by the local authority of a reserved function, the F228[chief executive] for that authority shall, in the doing of any such act, matter, or thing referred to in subsection (1), act with the express authorisation of the elected council of such local authority, and in any proceedings such authorisation shall be deemed to have been given unless or until the contrary is shown.