Extramural custody, control and employment of prisoners

A prisoner, when being taken to or from any prison, in which he may be lawfully confined, or to a court for production or to a hospital for medical treatment, or whenever he is working outside or is otherwise beyond the limits of any such prison in or under the lawful custody or control of a prison officer or prison staff belonging to such prison, or any other officer deployed for such duty, shall be deemed to be in prison and shall be subject to all directions and discipline, as if he were actually in prison.