These Rules amend the Service Custody and Service of Relevant Sentences Rules 2009 (S.I. 2009/1096) (the “Service Custody Rules”), so as to prohibit smoking in the Military Corrective Training Centre (“MCTC”) and other service custody facilities. They also make provision allowing for a detainee to be released on the order of a commanding officer, where the commanding officer has exercised their power to vary a punishment or rescind an activation order that the commanding officer had no power to make.