If, for any reason, a relevant authority:
(a) is unable to arrange for the establishment of a Joint Selection Committee for the purpose of giving advice to the relevant authority with respect to the filling of the vacancy; or
(b) having arranged for the establishment of a Joint Selection Committee for such a purpose, is unwilling to transfer or promote an officer in accordance with the advice of the Committee;
the relevant authority may transfer or promote an officer to fill the vacancy under section 27.