
HMP Addiewell is a prison located near to the village of Addiewell in West Lothian, Scotland. HMP Addiewell is operated by a private company, Sodexo Justice Services and contracted to the Scottish Prison Service. The prison holds adult males who have been convicted as well as those being held on remand.

HM Prison Altcourse is a Category A/B men's private prison and Young Offender Institution in the Fazakerley area of Liverpool in Merseyside, England. The prison is operated by G4S.

HM Prison Ashfield is an adult male sex offenders prison located in the village of Pucklechurch, in Gloucestershire, England. The prison is operated by Serco.

HM Prison Buckley Hall is a Category C men's prison in the Buckley district of Rochdale in North West England. It is operated by Her Majesty's Prison Service.

Dovegate Prison is a Category B men's private prison, located near Uttoxeter in Staffordshire, England. The prison is operated by Serco.

Dungavel Immigration Removal Centre is an immigration detention facility in South Lanarkshire, Scotland, near the town of Strathaven that is also known as Dungavel Castle or Dungavel House. It is operated by the American private prison firm GEO Group, under contract with the law-enforcement command Border Force for its detention of immigrants for the Home Office. It is the only such facility in Scotland.

HM Prison Forest Bank is a Category B men's private prison, in the Agecroft area of Pendlebury in Salford near Manchester, England. The prison is operated by Sodexo Justice Services.

G4S is a British multinational private security company headquartered in London, England. The company was set up in 2004 when London-based Securicor amalgamated with Danish firm Group 4 Falck. The company offers a range of services, including the supply of security personnel, monitoring equipment, response units and secure prisoner transportation. G4S also works with governments overseas to deliver security services.

HMP Bronzefield is an adult and young offender female prison located on the outskirts of Ashford in Middlesex, England. Bronzefield is the only purpose-built private prison solely for women in the UK, and is the largest female prison in Europe. The prison is operated by Sodexo Justice Services.

HM Prison Oakwood is a Category C prison in Featherstone, Staffordshire, England. First opened in April 2012, the prison is operated by G4S and was primed to be in full operation by autumn 2012. Originally called Featherstone 2 and designed to be a titan prison, it was downsized to hold up to 1,605 prisoners with construction starting in August 2009. It was built in a modular fashion, the first time this had been done in the UK.

HM Prison Rye Hill is a Category B men's private prison, operated by G4S. Rye Hill has exclusively housed sex offenders since 2014. The prison is next to HMP Onley and Rainsbrook Secure Training Centre, south of Rugby, in the parish of Barby, Northamptonshire, England. However, the postal address of the prison is Willoughby, Warwickshire; therefore, most sources list the prison as in Willoughby, Warwickshire.

HM Prison Wolds was a Category C men's prison, located south-west of Everthorpe, in the East Riding of Yorkshire, England. The prison was operated by Her Majesty's Prison Service, and was situated next to HMP Everthorpe. The two neighbouring prisons were merged in 2014, and renamed HM Prison Humber.

HM Prison Kilmarnock is a prison in Bowhouse, Hurlford near Kilmarnock, East Ayrshire, Scotland. It is situated 3 miles (5 km) south-east of Hurlford on the Mauchline Road. Its location means it is locally known as Bowhouse Prison.

HM Prison Parc is a Category B men's private prison and Young Offenders Institution in Bridgend, Mid Glamorgan, Wales. Parc Prison is operated by G4S, and is the only privately operated prison in Wales.

Serco Group plc is a British company with headquarters based in Hook, Hampshire, England. Serco primarily derives income as a contractor for the provision of government services, most prominently in the sectors of health, transport, justice, immigration, defence, and citizens services.

Sodexo Justice Services, a subsidiary of Sodexo, is a company that provides custodial and post-release facilities for the United Kingdom Home Office. The company changed its name to Sodexo Justice Services in 2011.

HM Prison Thameside is a Category B men's private prison in the Thamesmead area of the Royal Borough of Greenwich, south-east London, England. Thameside Prison is operated by Serco and is situated next to Belmarsh and Isis prisons.

Yarl's Wood Immigration Removal Centre is a detention centre for foreign nationals prior to their deportation from the United Kingdom, one of 10 such centres currently in the UK. It is located near Milton Ernest in Bedfordshire, England, and is operated by Serco, which describes the place as "a fully contained residential centre housing adult women and adult family groups awaiting immigration clearance." Its population is, and has been, overwhelmingly female.