13—(1) For the purposes of this Act, action is taken by a listed authority if it is taken by—
(a)that authority,
(b)a member, officer or member of staff of the authority acting in the discharge of functions of the authority,
(c)a person to whom the authority has delegated any function, in the discharge of that function,
(d)any other person acting on behalf of the authority.
(2) In this Act references to action taken by a listed authority include a failure to act on the part of the authority; and such other expressions connoting action are to be construed accordingly.