Sleeping accommodation
19.—(1) No room or cell shall be used as sleeping accommodation for an inmate unless it has been certified by an officer of the Secretary of State (not being an officer of a young offender institution) that its size, lighting, heating, ventilation and fittings are adequate for health, and that it allows the inmate to communicate at any time with an officer.
(2) A certificate given under this rule shall specify the maximum number of inmates who may sleep in the room or cell at one time, and the number so specified shall not be exceeded without the leave of the Secretary of State.