Battle of Britain Bunker

File:RAF Fighter Command Dowding System.jpg

As the location of No. 11 Group RAF's Operations Room, The Battle of Britain Bunker was one of the key parts of the world's first integrated air defence system. Often known as the "Dowding system" (after Air Chief Marshal Sir Hugh Dowding, Commander-in-Chief Fighter Command at the time of installation), the system linked Fighter Command with Anti-Aircraft Command, Barrage Balloon Command, the Observer Corps, Chain Home Radio Direction Finding (radar), and the intelligence services. Under the system, these organisations worked together for the first time in order to achieve one goal: the successful defence of the UK's airspace.{{cite web|url=http://www.iwm.org.uk/history/what-was-the-dowding-system|title=What was the Dowding system?|publisher=Imperial War Museum|accessdate=30 April 2017}}

No. 11 Group was an important part of the system for several reasons: Firstly, as one of four group headquarters, No. 11 Group's Operations Controller was responsible for making key decisions that would affect the outcomes of aerial battles - how many fighter aircraft to scramble, which type of aircraft, which squadrons to use, when to scramble them, where to scramble them from, where to scramble them to, etc. Secondly and also due to its role as a group headquarters, No. 11 Group was responsible for organising and coordinating the activities of seven sector stations at which its fighter squadrons were based - RAFs Kenley, North Weald, Debden, Biggin Hill, Tangmere, Hornchurch and Northolt. And thirdly, the Bunker and its Operations Room were the prototypes by which the other five group headquarters (No. 9 Group at RAF Barton Hall, No. 10 Group at RAF Box, No. 12 Group at RAF Watnall, No. 13 Group at RAF Newcastle and No. 14 Group at Raigmore) were planned and constructed.Bungay 2010, p. 47

The Operations Room displayed various pieces of information in different ways, which the controller would then use in order to make his important decisions. The location of both enemy and friendly aircraft formations was displayed using numbered blocks on a map table. The current activities of No. 11 Group's squadrons e.g. "At Standby", "Enemy Sighted", "Ordered to Land", etc. were displayed on a "tote" board using a series of lights.{{cite web|url=http://www.radarmuseum.co.uk/battle%20of%20britain.htm|title=Battle of Britain - 1940s room|publisher=Radar Museum|accessdate=30 April 2017|archive-url=https://web.archive.org/web/20161010105555/http://www.radarmuseum.co.uk/battle%20of%20britain.htm|archive-date=10 October 2016|url-status=dead}} Current weather conditions at No. 11 Group's sector stations were indicated with a system of coloured discs. And the passage of time was tracked using a coordinated system of clock and coloured indicators.{{cite web|url=http://www.tangmere-museum.org.uk/artefact-month/battle-of-britain-sector-clock|title=Battle of Britain sector clock|date=August 2015 |publisher=Tangmere Museum|accessdate=30 April 2017}} All information was received from either Fighter Command headquarters or the sector stations via telephone.{{cite web|url=http://www.iwmprints.org.uk/image/742592/devon-s-a-mr-waaf-telephone-operators-in-raf-fighter-commands-sector-g-operations-room-at-duxford-cambridgeshire-receiving-reports-of-enemy-aircraft-plots-from-observer-corps-posts-september-1940|title=WAAF telephone operators in RAF Fighter Command's Sector 'G' Operations Room at Duxford, Cambridgeshire, receiving reports of enemy aircraft plots from Observer Corps posts, September 1940|publisher=Imperial war Museum|accessdate=30 April 2017|archive-url=https://web.archive.org/web/20171207203519/http://www.iwmprints.org.uk/image/742592/devon-s-a-mr-waaf-telephone-operators-in-raf-fighter-commands-sector-g-operations-room-at-duxford-cambridgeshire-receiving-reports-of-enemy-aircraft-plots-from-observer-corps-posts-september-1940|archive-date=7 December 2017|url-status=dead}}

File:Battle of Britain Bunker with Spitfire.jpg gate guardian outside the Battle of Britain Bunker]]

File:Allied Defence Plot.jpg

Following excavations in 1938, the Bunker was constructed between February and August 1939 with the express intention of housing the No. 11 Group (Fighter Command) Operations Room, in essence a number of rooms with various roles and functions. Their previous Operations Room had been in an above ground building at RAF Uxbridge, but following the Munich Crisis of September 1938 and with the spectre of war on the horizon, the RAF began work on a protected underground alternative. The Bunker was built by Sir Robert McAlpine, a civilian company, but its construction was to remain top secret to avoid the plans falling into enemy hands.{{cite web|url=http://modgov.hillingdon.gov.uk/documents/s28853/07%20-%20FINAL%20Cabinet%20Report%20RAF%20Bunker%20Enclave%201.pdf|title=RAF Battle of Britain bunker enclave|accessdate=30 April 2017}}

The floor of the Bunker is 60 ft underground and is accessed by a staircase of 76 steps.{{cite web|url=http://www.middlesexexplorer.com/explore-no-11-group-operations-room-at-the-battle-of-britain-bunker-in-uxbridge-middlesex/|title=Visit No 11 Group Operations Room at The Battle of Britain Bunker in Uxbridge, Middlesex|date=25 June 2013|publisher=Middlesex Explorer|accessdate=30 April 2017|archive-date=22 February 2019|archive-url=https://web.archive.org/web/20190222041816/http://www.middlesexexplorer.com/explore-no-11-group-operations-room-at-the-battle-of-britain-bunker-in-uxbridge-middlesex/|url-status=dead}} All utilities into and out of the building - electricity, water, telephone lines, sewage - are carried along pipes down this staircase. The walls, floor and ceiling are approximately 1 metre thick and are made of concrete with waterproof lining. The solid concrete walls and the approximately 30 ft of earth above the Bunker's ceiling meant that no bomb of the period could penetrate it. A ventilation and air filtration system, which still is in operation, was installed to provide an air supply to the Operations Room staff.{{cite web|url=https://historicengland.org.uk/listing/the-list/list-entry/1392556|title=Group Operations Room|publisher=Historic England|accessdate=30 April 2017}}

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On 6 September 1939 in the Battle of Barking Creek, three days into the Second World War No. 11 Group was involved in an incident of friendly fire. The Chain Home radar system reported incoming enemy aircraft for the first time and the No. 11 Group Controller, working in the Bunker, despatched 56 Squadron and 74 Squadron to deal with the threat. Unfortunately the Spitfires of 74 Squadron mistook the Hurricanes of 56 Squadron for the enemy and shot two of them down.Bishop 2004, p. 108 In April 1940 Air Vice-Marshal Keith Park was posted to No. 11 Group as its Air Officer Commanding and joined the team in the bunker.{{cite web|url=http://www.rafweb.org/Biographies/Park.htm|title=Air Vice-Marshal Keith Park|publisher=Air of Authority|accessdate=30 April 2017}}

The Luftwaffe waged a campaign against the Royal Air Force aimed at destroying Fighter Command. Of the four Fighter Command groups, No. 11 Group, controlled from the bunker, saw the most action and shot down many of the 1,733 German aircraft lost.{{cite book|last=Campion|first=Garry|title=The Battle of Britain, 1945-1965: The Air Ministry and the Few|url=https://books.google.com/books?id=XZ6FCwAAQBAJ&pg=PA89|year=2015|publisher=Palgrave Macmillan UK|isbn=978-1-137-31626-4|page=89}} On 12 August 1940, the Luftwaffe, which had been attacking British ports, switched targets and attacked the Chain Home radar system but only minor damage to the radar system was sustained.{{cite web|url=http://www.historyofwar.org/articles/battle_of_britain.html|title=Battle of Britain, 10 July-31 October 1940|last=Rickard|first= J|date=8 March 2011|accessdate=30 April 2017}} On the following day, known to the Germans as "Eagle Day", they started targeting British airfields. The prime minister, Winston Churchill, visited the bunker on 16 August 1940 and spoke the famous words "Never in the field of human conflict was so much owed, by so many, to so few". He said the phrase as he got into his car, close to the entrance of the Bunker, then repeated them in the House of Commons on 20 August 1940.{{cite book|url=https://books.google.com/books?id=0iZmBgAAQBAJ&pg=PT158|title=Princes at War: The British Royal Family's Private Battle in the Second World Wat|first= Deborah|last= Cadbury|publisher=Bloomsbury|year=2016|isbn= 978-1408845080}} The King and Queen visited the bunker on 6 September 1940.{{cite web|url=http://www.rafaleicester.org.uk/index.php/royal-air/1398-king-and-queen-visit-bunker|date=6 September 1940|title=King and Queen visit No. 11 Group Ops Room and the first operational sortie by No.12 Group's "Big Wing"|accessdate=30 April 2017}} After the Luftwaffe switched its target to London on 1 September 1940, Churchill visited again on 15 September 1940 and wrote in his memoirs about the moment at which "all of the bulbs glowed red", referring to the squadron state boards in the Operations Room and indicating that every No. 11 Group squadron was engaged in combat at the same time.{{cite web|url=http://thetimechamber.co.uk/beta/sites/military/uk-sites/raf-uxbridge-battle-of-britain-fighter-command-bunker|title=Battle of Britain Bunker|date=18 August 2016 |publisher=Timechamber|accessdate=30 April 2017}}

In December 1940 Air Vice Marshal Sir Trafford Leigh-Mallory, became air Officer Commanding No. 11 Group.{{cite web|url=http://www.rafweb.org/Biographies/Leigh-Mallory.htm|publisher= Air of Authority – A History of RAF Organisation |title= Air Chief Marshal Sir Trafford Leigh-Mallory|accessdate=30 April 2017}} The old plotting system of wooden markers and wooden croupier-style pushing sticks were replaced with metal plotting markers and magnetic sticks, and the old tote system of light-indicators was replaced with a slat-board system with hanging information. After the final stages of the Battle of Britain, No. 11 Group was largely occupied with defending London against the Blitz.{{cite web|url=https://www.telegraph.co.uk/history/battle-of-britain/11865303/The-Battle-of-Britain-as-it-happened-on-September-15-1940-live.html|archive-url=https://web.archive.org/web/20150917154405/http://www.telegraph.co.uk/history/battle-of-britain/11865303/The-Battle-of-Britain-as-it-happened-on-September-15-1940-live.html|url-status=dead|archive-date=17 September 2015|title=The Battle of Britain, as it happened on September 15, 1940|publisher=The Telegraph|accessdate=30 April 2017}} No. 11 Group was involved in providing air support for the Dieppe Raid (Operation Jubilee) on 19 August 1942.{{Cite web |url=http://www.globalaviationresource.com/reports/2010/uxbridge.php |title=Farewell to RAF Uxbridge |date=6 April 2010 |publisher=Global Aviation Resource |accessdate=12 September 2010}} The air operations section of Operation Overlord, the 6 June 1944 Normandy landings (D-Day), was also controlled from RAF Uxbridge.{{Cite web |url=http://www.raf.mod.uk/rafnortholt/newsweather/index.cfm?storyid=237E237C-5056-A318-A8414AA43AE12B42 |title=Refurbished Spitfire Gate Guardian Unveiled at 11 Group Bunker |publisher=Royal Air Force |accessdate=6 June 2011}}

No. 11 Group moved to RAF Martlesham Heath on 14 April 1958 and Dowding unveiled a memorial{{coord|51|32|26.2|N|000|27|52.7|W|type:landmark_scale:1000_region:GB-HIL|display=inline|name=Battle of Britain Bunker Monument}} close to the entrance to the bunker, commemorating its role during the Battle of Britain.{{cite video|date=September 2009 |title=No. 11 Fighter Group Royal Air Force Operations Room Memorial |url=http://www.decoinstyle.co.uk/USERIMAGES/Uxbridge17.jpg |format=JPEG |medium=image |publisher= Deco in Style |location=RAF Uxbridge, UK |accessdate=24 February 2011 |url-status=dead |archiveurl=https://web.archive.org/web/20120320181909/http://www.decoinstyle.co.uk/USERIMAGES/Uxbridge17.jpg |archivedate=20 March 2012}} Over nine months in 1975, the No. 11 Group Operations Room was restored to its original state.Crozier 2007, p. 22

In 1985 a museum occupying six rooms was created within the bunker by Warrant Officer Robert "Chris" Wren and the Operations Room opened for daily visits.Crozier 2007, p. 23 In July 2015, the Government pledged £1 million for the restoration of the bunker, and the construction of a new visitor centre above ground. Hillingdon Council provided a further £4.5 million for the new centre.{{cite news|last1=Bax|first1=Steve|last2=Clementine|first2=Katherine|title=Cash injection will preserve Uxbridge's wartime bunker for future generations|url=http://www.getwestlondon.co.uk/news/west-london-news/cash-injection-preserve-uxbridges-wartime-9648639|accessdate=7 September 2015|work=Uxbridge Gazette|date=14 July 2015}} The visitor centre opened in March 2018.{{cite web|url=http://www.hillingdonishere.co.uk/index.php/news/item/651-uxbridge-world-war-2-bunker-centre-soars-to-victory-in-prestigious-awards|title=Uxbridge World War 2 Bunker centre soars to victory in prestigious awards|date=21 May 2018|publisher=Hillingdon is here|accessdate=29 July 2018}}{{Dead link|date=June 2022 |bot=InternetArchiveBot |fix-attempted=yes }}

{{reflist|30em}}

• {{cite book|last=Bishop |first=Patrick |title=Fighter Boys |year=2004 |publisher=Harper Perennial |location=London |edition=4th |isbn=978-0-00-653204-0}}
• Bungay, Stephen. (2010) The Most Dangerous Enemy: A History of the Battle of Britain. Aurum Press {{ISBN|978-1-84513-481-5}}
• Crozier, Hazel. (2007) RAF Uxbridge 90th Anniversary 1917–2007. RAF High Wycombe: Air Command Media Services

• No. 11 Group Operations Room Museum. The Battle of Britain 70th Anniversary. RAF Uxbridge
• Orange, Vincent. (2000) Park: The Biography of Air Chief Marshal Sir Keith Park, GCB, KBE, MC, DFC, DCL . Grub Street {{ISBN|978-1-902304-61-8}}
• Wood, Derek; Dempster, Derek. (2010) Narrow Margin. Pen & Sword Aviation {{ISBN|978-1-84884-314-1}}

{{Commons category|Battle of Britain Bunker}}

• [http://www.battleofbritainbunker.co.uk/ Official Website]
• [http://www.raf.mod.uk/rafnortholt/localareainformation/ Battle of Britain Bunker, RAF Northolt]
• [http://locations.landmarcsolutions.com/places/index.php?view=location_images&location_id=204 Uxbridge Group 11 Bunker]{{Dead link|date=October 2019 |bot=InternetArchiveBot |fix-attempted=yes }} Film location information by the Ministry of Defence
• [https://www.telegraph.co.uk/news/uknews/8282138/Battle-of-Britain-headquarters-to-be-redeveloped.html An article about the bunker in The Telegraph, 26 January 2011]

{{LB Hillingdon}}

{{Grade I and II* listed British military structures}}

Britain Bunker

Category:History of the Royal Air Force during World War II

Category:Military history of Middlesex

Category:Museums in the London Borough of Hillingdon

Britain Bunker

Category:Military command and control installations

Category:Grade I listed buildings in the London Borough of Hillingdon

Category:Military history of London

Britain Bunker

Category:History museums in London

Category:Military aviation museums in London

Category:Bunkers in the United Kingdom

Category:Uxbridge