Question: The airport adjacent to the Cedars immigration detention facility is located how far away from Central London?

Context paragraphs:
Gatwick Airport: Gatwick Airport (also known as London Gatwick) (IATA: LGW, ICAO: EGKK) is a major international airport in south-east England, 29.5 mi south of Central London and 2.7 NM north of Crawley.  It is the second-busiest airport by total passenger traffic in the United Kingdom, after London Heathrow.  Gatwick is the eighth-busiest airport in Europe.  Until 2016, it was the busiest single-use runway airport in the world before being overtaken by Mumbai's Chhatrapati Shivaji International Airport.

Dungavel: 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's the only such facility in Scotland.

Cedars (immigration detention): Cedars was an immigration detention facility in Crawley, West Sussex, United Kingdom adjacent to Gatwick Airport.  It was operated by UK Visas and Immigration with security and facilities maintenance contracted out to G4S and Barnardo's providing social workers and child welfare services.

Donald W. Wyatt Detention Facility: The Donald W. Wyatt Detention Facility was established in 1993 as the nation’s first publicly owned and privately operated adult secure correctional facility and is currently operated by the Central Falls Detention Facility Corporation.  This special non-profit, quasi-public detention facility was developed for use by the United States Marshal Service (USMS) in the Northeast and was later extended to include the U.S. Immigration and Customs Enforcement (ICE) from 2005 to 2008.

LaSalle Detention Center: LaSalle Detention Center is an immigration detention facility of the U.S. Immigration and Customs Enforcement, operated by the GEO Group and located on 830 Pinehill Road, about two miles northwest of downtown Jena, La Salle Parish, Louisiana.  The prison admitted its first prisoners in 2007 and has a capacity of 1160.

Higashi Nihon Immigration Center: Higashi Nihon Immigration Center (East Japan Immigration Center aka.  Ushiku Shuyojo, Ushiku Detention Center) is one of three immigration detention centers of Japan operated by Ministry of Justice and located in Ushiku, Ibaraki prefecture.  It houses approximately 700 people both of males and females.  It opened in 1993 for the exceeded capacity of Yokohama Immigration Detention Center.  There have been claims among the human rights activists of imates being detained for lengthy periods.  March 11, 2011, because of the 2011 Tōhoku earthquake and tsunami the old facility was closed.

Nauru Regional Processing Centre: The Nauru Regional Processing Centre is one of many offshore Australian immigration detention facilities, located on the South Pacific island nation of Nauru.  The centre is operated by Broadspectrum (formerly Transfield Services) on behalf of the Department of Immigration and Border Protection a department of the Government of Australia that is responsible for immigration, citizenship and border control.  The use of immigration detention facilities is part of a policy of mandatory detention in Australia.

Maribyrnong Immigration Detention Centre: Maribyrnong Immigration Detention Centre is an Australian immigration detention facility in Maribyrnong, Victoria.  The centre was originally opened in 1966, as the Maribyrnong Migrant Hostel, then later the Midway (Migrant) Hostel in the late 1960s.  The Phillip Migrant Hostel was added later.

Villawood Immigration Detention Centre: Villawood Immigration Detention Centre (IDC) is an Australian immigration detention facility located in the suburb of Villawood in Sydney, Australia.  It mainly caters for people who have overstayed their visa permit or those who had their visa cancelled because they have failed to comply with their visa conditions, and some adult male and female asylum seekers who have arrived by boat without visas, whom the Australian government refer to as "Illegal Maritime Arrivals".

Harmondsworth Immigration Removal Centre: Harmondsworth Immigration Removal Centre is an immigration detention facility in Harmondsworth, London Borough of Hillingdon, near London Heathrow Airport run by Mitie.  Harmondsworth, which neighbours the Colnbrook Immigration Removal Centre, holds around 620 men.

Supporting paragraphs: Cedars (immigration detention) Gatwick Airport
Answer: 29.5 mi south