London District Signals

London District Signals was a headquarters signal unit of the Royal Engineers (RE) and later Royal Corps of Signals in Britain's Territorial Army from 1908. It served with a corps headquarters at Gallipoli and on the Western Front during World War I, and later became an air defence signal unit during World War II. Its successor unit continues in the Army Reserve today.

Origin
When the Territorial Force was created in 1908 as a result of the Haldane Reforms, the London Division, Electrical Engineers of the Royal Engineers (Volunteers) spun off three telegraph companies, later termed signal companies: Together, these companies formed London District Signals, defined as 'Army Troops RE' in the TF organisation, serving HQ London District based at Horse Guards. The unit headquarters was at 12 Palmer Street, Westminster.
 * London Wireless Signal Company
 * London Cable Signal Company
 * London Air-Line Signal Company

World War I
In June 1915, London District Signals joined IX Corps HQ forming at the Tower of London and went to Gallipoli as IX Corps Signals. After the evacuation from Gallipoli, the Corps HQ went to France and served on the Western Front until the end of the war. The Corps Signals also ran a Signals Training Centre.

Interwar
When the renamed Territorial Army (TA) was reconstituted in 1920, London District Signals was reformed as 1st London Corps Signals (Army Troops) in the Royal Corps of Signals. It was retitled as Anti-Aircraft Signals in 1922, and then Air Defence Signals in 1925 when it formed 26th (London) and 27th (London) Anti-Aircraft Brigade Signals Companies. 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. It was based at 46 Regency Street, the former Drill Hall of the London Electrical Engineers. 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.

World War II
Together, 1st and 6th AA Divisions defended London and the Thames Estuary during The Blitz. When AA Command was reorganised in October 1942 they became 1 AA Group and 2 AA Group operating alongside No. 11 Group RAF and taking a leading role in defence against V-1 flying bombs (Operation Diver) in 1944–45.

Postwar
On the re-establishment of the TA in 1947, 1 and 2 AA Group Signals re-merged and were numbered 11 AA (Mixed) Signal Regiment ('mixed' indicating that members of the Women's Royal Army Corps were integrated into the unit) and was based at Kensington. The unit was retained when AA Command was disbanded in 1955, becoming the East Anglian District Signal Regiment of the Army Emergency Reserve (AER), and being numbered 83 Signal Regiment in 1959. The size of the TA was reduced in 1967, when 83 Signal Regiment (AER) became 83 Signal Squadron (Volunteers) and later 83 Support Squadron in 31 (City of London) Signal Regiment, which was disbanded in 2010.

In 2010, 83 Support Sqn was renamed 47 Signal Troop, (recognising the former 47th (2nd London) Division) and became part of 71 (City of London Yeomanry) Signal Regiment. The Troop is based in Uxbridge and Southfields.

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

Online sources

 * Air Formation Signals Association
 * British Army website
 * British Military History
 * Great War Forum
 * Graham Watson, The Territorial Army 1947