(1)Where any person has been sentenced under this Act to imprisonment or detention and the sentence is not for the time being suspended under section ninety of this Act, the unexpired portion of the sentence may be remitted by an order made—
(a)in any case, by the Admiralty or by any officer holding such command as may be prescribed by regulations made by the Admiralty ;
(b)where the committal order or last committal order under section eighty-one or section ninety-one of this Act was issued by an officer not holding such command, by that officer,
and in any such case the offender shall be discharged from custody.
(2)Any sentence of imprisonment or detention which is for the time being suspended under the said section ninety may at any time be reconsidered by the Admiralty or any other authority by whom the sentence was or could have been suspended, and shall be so reconsidered at intervals of not more than three months; and if on any such reconsideration it appears that the conduct of the offender since his conviction has been such as to justify remission of the sentence, whether in whole or in part, it shall be remitted accordingly.