(1) A police officer may be reduced (a) to a lower rank (except in the case of Sergeants and of Constables on the time-scale); (b) from the selection grade of a rank to the time-scale of the same rank; (c) if in a graded rank, to a lower position in the seniority list of his grade or to a lower grade in his rank. A police officer so reduced shall be placed in the time-scale to which he is reduced, whether from higher rank or from the selection grade of the same rank, at the point to which his approved service entitles him, but below the efficiency bar, if any. An officer reduced in rank shall not be placed in the selection grade of the rank to which he is reduced. (2) An upper subordinate shall not ordinarily be reduced to the rank of Head Constable, unless he has been promoted from that rank and is capable of performing the duties of a Head Constable. If he is absolutely unfitted for his position or for that of a Head Constable, he shall be dismissed, and not reduced in rank. (3) A Head Constable reduced to the rank of Constable shall ordinarily occupy a position in the gradation list of Constables according to the length of his approved service.