Other subject searches to try in SOLO for works on this specific topic
Alien detention centers
Detention of persons
Illegal aliens -- Services for
Refugees -- Services for
Reports of inspections of the UK's
immigration holding/removal/detention centres
Paper copies are kept in the Official Papers Collection on the Floor 0 of the Bodleian Law Library: shelf mark O.GB. per. 20. To find them collectively use the SOLO subject search: Alien detention centers. They are also individually catalogued in SOLO