IRCs and STHFs
Detention centres can be Immigration Removal Centres (IRCs) where people are held indefinitely, or Short Term Holding Facilities (STHFs) where they can be held for up to seven days.
Detainees are also held in non-residential STHFs for up to 24 hours. These facilities are holding rooms in ports or airports. And many hundreds of people are held under immigration acts in mainstream prisons.
There are nine detention centres, and four residential STHFs (including Cedars, which is designated 'pre-departure accomodation').