(1)Any person who, having been sentenced to imprisonment, corrective training, preventive detention or Borstal training, or ordered to be detained in a detention centre, or having been committed to a prison or remand centre, is unlawfully at large, may be arrested by a constable or prison officer without warrant in any part of Great Britain and taken to the place in which he is required in accordance with law to be detained.
(2)Where any person sentenced to imprisonment, corrective training, preventive detention or Borstal training, or ordered to be detained in a remand home or detention centre, is, at any time during the period for which he is liable to be detained in pursuance of the sentence or order, absent, otherwise than with lawful authority, from the prison, Borstal institution, remand home or detention centre, as the case may be, then, unless the Secretary of State otherwise directs, no account shall be taken, in calculating the period for which he is liable to be so detained, of any time during which he is so absent:
Provided that this subsection shall not apply to any period during which any such person as aforesaid is detained in pursuance of an order of any court in a prison or other institution to which the Prisons (Scotland) Acts, 1860 to 1926 apply.
(3)For the purposes of this section, a person who, after being temporarily released in pursuance of rules made under subsection (6) of section fifty-three' of this Act, is at large at any time during the period for which he is liable to be detained in pursuance of his sentence shall be deemed to be unlawfully at large if the period for which he was temporarily released has expired or if an order recalling him has been made by the Secretary of State in pursuance of the rules.