During the

Cold War The Cold War was a period of global Geopolitics, geopolitical rivalry between the United States (US) and the Soviet Union (USSR) and their respective allies, the capitalist Western Bloc and communist Eastern Bloc, which lasted from 1947 unt ...

every

London Borough The London boroughs are the current 32 districts of England, local authority districts that together with the City of London make up the administrative area of Greater London, England; each is governed by a London borough council. The present ...

was obliged to have a Civil Defence centre. These were controversial structures as it was widely believed that planning for the aftermath of

nuclear war Nuclear warfare, also known as atomic warfare, is a War, military conflict or prepared Policy, political strategy that deploys nuclear weaponry. Nuclear weapons are Weapon of mass destruction, weapons of mass destruction; in contrast to conven ...

was both expensive and pointless.{{cn, date=January 2023 The area of

London London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...

(extending outwards to the then boundary of the

Metropolitan Police District The Metropolitan Police District (MPD) is the police area which is policed by the Metropolitan Police Service in London. It currently consists of the Ceremonial counties of England, ceremonial county of Greater London, which excludes the City of ...

and thus including some areas outside the modern

Greater London Greater London is an administrative area in England, coterminous with the London region, containing most of the continuous urban area of London. It contains 33 local government districts: the 32 London boroughs, which form a Ceremonial count ...

) was designated Region 5 and had its regional seat of government in a re-used

radar station Radar is a system that uses radio waves to determine the distance (''ranging''), direction (azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track aircraft ...

Kelvedon Hatch Kelvedon Hatch is a village and civil parish in the Borough of Brentwood in south Essex, England. It is situated just north of Pilgrims Hatch, approximately to the north of Brentwood and is surrounded by Metropolitan Green Belt. In 2019 the ...

Essex Essex ( ) is a Ceremonial counties of England, ceremonial county in the East of England, and one of the home counties. It is bordered by Cambridgeshire and Suffolk to the north, the North Sea to the east, Kent across the Thames Estuary to the ...

. Below this level it was split into five groups – North, North East, North West, South East and South West. Each group had a control centre. Below this each borough had one as well.