Short-term holding facilities are places either used solely for the detention of immigration detainees for a period of not more than seven days (or, in the case of a holding room, for a period of not more than 24 hours unless a longer period is authorised) or used for the detention of immigration detainees for not more than seven days or for such other period as may be prescribed and for other persons for any period. These Rules make provision for the regulation and management of short-term holding facilities, including the treatment of detained persons and the conduct and duties of officers in the facility. The Rules provide for matters such as the admission and discharge of detained persons, their welfare, food, clothing, accommodation, recreation and religious observance, correspondence, visits, health care and any complaints they may wish to make, as well as the use of security measures such as powers of search.
Link: The Short-term Holding Facility Rules 2018
Source: Legislation .gov.uk