Handel (warning system)

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Codename for the former attack warning system in the UK

title: "Handel (warning system)" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["cold-war-military-equipment-of-the-united-kingdom", "civil-defense", "emergency-management-in-the-united-kingdom", "united-kingdom-nuclear-command-and-control", "emergency-population-warning-systems", "cold-war-military-history-of-the-united-kingdom", "color-codes"] description: "Codename for the former attack warning system in the UK" topic_path: "history" source: "https://en.wikipedia.org/wiki/Handel_(warning_system)" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Codename for the former attack warning system in the UK ::

::callout[type=note] the British national attack warning system ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/e/e4/Hack_Green_Secret_Nuclear_Bunker_objects_12.JPG" caption="Multiple WB1400 Carrier Control Points on display at [[Hack Green Secret Nuclear Bunker]]. A WB1800 Operating Unit is visible in the right foreground."] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/7/7d/Wb1401warning_receiver_ptreehse.jpg" caption="WB1401 Speech Receiver with matching loudspeaker unit."] ::

Handel was the code-name for the United Kingdom's national attack warning system in the Cold War that was in place between 1962 and 1992. It consisted of two injection sites (RAF High Wycombe and the Royal Observer Corps Group 21 bunker in Goosnargh, Lancashire) linked to a series of two hundred and fifty-two carrier control points installed in major police stations; in turn, the control points were linked to several thousand receiver units installed at "warning points" in various police, fire, and coastguard stations, government buildings, hospitals, industrial centres, and Royal Observer Corps posts,

A Handel warning console can be seen at the Imperial War Museum in London among their Cold War exhibits, alongside the warning apparatus used by Kent Police (which was located at Maidstone police station to activate the sirens).

Operation

If an enemy attack was detected, a key on the left-hand side of an "operating unit" console at one or both of the injection sites would be turned and two lights would come on; the operator would then press and hold down a red button and announce "Attack Warning Red".

Linked into Handel were the twenty-five Royal Observer Corps group controls, also with direct links to the carrier control points. As fallout from an eventual nuclear attack began to descend, "black" fallout warnings could be generated from the group controls on a localised basis over the same carrier wave system.

Initial Handel equipment fell under the WB400 and WB600 series of designations; to an EMP-resistant equipment line falling under the WB1400 series of designations. WB1400-series receivers were also trickle-charged to ensure that they would work when needed (while earlier receivers often suffered from unnecessary battery drainage due to being erroneously left on outside of test periods). The "operating unit" console at the injection sites was known as the WB1800.

The Handel system was based around the telephone system used for the speaking clock.

Warning messages

::data[format=table]

Message	How it is received	Action to be taken	Notes
Test broadcast (War emergency)	The words "Test call, testing" (said three times) followed by the message: "A test of the Attack Warning signal will now follow" (also said three times). This would be followed by various signals and then the message: "A test of the Attack Warning signal has just been made" (said twice).	None	title=Carrier Control Card 2, War Emergency Pre Attack Action
Attack warning	last1=McCamley	first1=Nick	title=Cold War Secret Nuclear Bunkers
Fallout warning	High-pitched pip signal followed by a spoken message. For example: "Fallout warning BLACK, London!"	Fire warning maroon three times. Though in some areas, it could have been three gongs, whistles, or even church bells creating one long note followed by two short notes forming the morse note "D-".	Fallout warning would be broadcast on the radio "wherever possible". Could also be given by word of mouth from the police and ROC staff.
Fallout expected within one hour or more	High-pitched pip signal followed by the spoken message. For example: "Fallout warning GREY, Canterbury!"	Fire warning maroon or sound siren producing one long note but interrupted in short succession. Could also be given by church bells or word of mouth from the police and civil defence wardens	Fell out of use by the late 1960s.
All clear	High-pitched pip signal followed by a spoken message: "Attack message WHITE!" A minute-long control tone would activate the powered sirens, though activating these was only warranted if the all-clear message was to apply to all warning districts rather than to a specific district or districts. Hand-cranked sirens would be operated in response to a general all-clear message or in response to an all-clear message applying to their specific warning district.	Sound siren giving a steady note	Further warnings may be broadcast on radio, along with information on aid for survivors and morale-boosting broadcasts (There was also a "confidence tone" that demonstrated the system was working and advised listeners to stand by for a warning at any time).
::

Notes

References

(2011). "Signalling Equipment, Handel Unit 1A, British".
"WB1400 and HANDEL Page 1 of 2".
"THE HOLE IN THE GROUND [Main Title]".
(30 August 2012). "Sound An Alarm (1971) - United Kingdom Warning and Monitoring Organization".
(c. 1980s). "Instructions For Warning Point Operators". [[Derbyshire Constabulary]].
(4 March 2014). "Cold War Secret Nuclear Bunkers". [[Pen and Sword Books]].
(4 April 2024). "Attack Warning Red!: How Britain Prepared for Nuclear War". [[Penguin Random House.
"Carrier Control Card 3, War Emergency Public Warning Action".
(2015). "War Plan UK".
(1985). "UKWMO: United Kingdom Warning and Monitoring Organisation". [[Central Office of Information]].
(4 April 2024). "Attack Warning Red!: How Britain Prepared for Nuclear War". [[Penguin Random House.
(1986). "Royal Observer Corps - Posts, Crew Operating Procedures Part F, Section 5, At Fallout Warning "Black" or On Arrival of Fallout".
(May 1989). "Standard Operating Procedures, Joint Annexes Issue 3, Annex P, WB1400 Carrier Receiver".
(1986). "Royal Observer Corps - Posts, Crew Operating Procedures Part F, Section 7, At Attack Message 'White'".
(August 2003). "Cold War Early Warning System".
"Carrier Control Card 2, War Emergency Pre Attack Action".
(4 March 2014). "Cold War Secret Nuclear Bunkers". [[Pen and Sword Books]].
"Struggle for Survival, File 16: Civil Defence Communications and Warning".
(1960). "Civil Defence Pocket Book No. 3: General Information (All Sections)". [[Office of Public Sector Information.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::