During the last war the boroughs of Greater London were divided pie-like into five sectors, three north and two south of the Thames. This division continued to be used for civil defence into the 1990s.
With the re-emergence of civil defence in the early 1950s, four of the sectors were provided with war rooms originally known as “sub-regional commissioner’s offices”. These four London group controls were identical and were located at: Partingdale Lane; Mill Hill (opposite the barracks and next to the sub-station just on the bend), Northumberland Avenue; Wanstead (behind the council estate) Kemnal Manor; Chislehurst (a long way down Kemnal Road) Church Hill Road; Cheam (next to Queen Victoria pub).
The NE Group War Room at Wanstead was demolished in 2000 and the site is now occupied by a nursing home.