[4][5][6] On the outbreak of war in August 1914 the London Wireless Signal Company was temporarily attached to 1st Mounted Division, but had left by March 1915.

[3][6][10] When 1st Anti-Aircraft Division was formed at RAF Uxbridge in 1935 (with 26 and 27 AA Bdes under command), the unit provided the signals component.

[3][11] The divisional signals unit was duplicated for 6th Anti-Aircraft Division in 1939 when the TA doubled in size after the Munich Crisis.

6th AA Division took responsibility for the air defence of the Thames estuary, Essex and North Kent, with its HQ at RAF Uxbridge.

As the war developed, increasing numbers of women from the Auxiliary Territorial Service (ATS) became integrated into AA and signals units, which were termed 'Mixed'.

[21][22] The first Honorary Colonel of London District Signals was Col A. Bain, TD, MICE, MIEE, appointed on 14 July 1912.