(1)No order of dismissal, removal or reduction shall be passed on a member of the subordinate services unless he has been informed in writing of the grounds on which it is proposed to take action and has been afforded an adequate opportunity of defending himself. The grounds on which it is proposed to take action shall be reduced to the form of a definite charge or charges, which shall be communicated to the person charged, together with a statement of the allegations on which each charge is based and of any other circumstances which it is proposed to take into consideration, in passing orders on the case. He shall be required, within a reasonable time, to put in a written statement of his defence and to state whether he desires to be heard in person. If he so desires or if the authority concerned so directs, an oral enquiry shall be held. At that enquiry oral evidence shall be heard as to such of the allegations as are not admitted and the person charged shall be entitled to cross-examine the witnesses, to give evidence in person and to have such witnesses called as he wish, provided that the officer conducting the enquiry may, for special and sufficient reasons to be recorded in writing, refuse to call a witness.