January–November – Experimental radio broadcasts including speech and music are made from a studio at the Marconi Company factory in Chelmsford, Essex.
13 May – "Hands Off Russia" campaign: London dockers refuse to load the SS Jolly George with munitions intended for Poland in the Polish–Soviet War.[6]
15 June – Australian soprano Nellie Melba becomes history's first well-known performer to make a radio broadcast when she sings two arias as part of the series of Marconi broadcasts from Chelmsford.
20 June – Five people are killed during severe rioting in Ulster.
24 June – Troops are sent to reinforce the Derry garrison.
Irish-born Roman Catholic Archbishop of Melbourne Daniel Mannix is detained on board ship off Queenstown and prevented from landing in Ireland or from speaking in the main Irish Catholic communities elsewhere in the UK.[11]
Blind Persons Act 1920 passed, the world's first disability-specific legislation, providing a pension allowance for blind persons aged between 50 and 70 years of age, directing local authorities to make provision for the welfare of blind people and regulating charities in the sector.
10 October – It is announced that compulsory hand signals are to be introduced for all drivers. Hand signals will remain a crucial part of motoring life until the 1970s, when the increased use of indicators on vehicles renders them no longer necessary.
14 October – The first women receive degrees at the University of Oxford, these being awarded retrospectively. Dorothy L. Sayers and Ivy Williams are among them.[16]
11 December – Irish War of Independence: the Burning of Cork: British forces set fire to 5 acres (20,000 m2) of the centre of the city of Cork, including the City Hall, in reprisal attacks after a British auxiliary is killed in a guerilla ambush.
^Woodward, David R. (September 2004). "Robertson, Sir William Robert, first baronet (1860–1933)". Oxford Dictionary of National Biography (Online ed.). Oxford University Press. doi:10.1093/ref:odnb/35786. Retrieved 7 December 2007. (Subscription or UK public library membership required.)
^Price, D.T.W. (1990). A History of the Church in Wales in the Twentieth Century. Penarth: Church in Wales Publications. ISBN 0-85326-026-5.
^"1950's - Games, results and tables". 3 September 2020.
^"Review of C. B. Purdom, The Building of Satellite Towns, J.M. Dent & Sons Ltd., 1925". Archived from the original on 7 September 2010. Retrieved 4 October 2010.
^Macfarlane, L. J. (December 1967). "Hands off Russia: Labour and the Russo–Polish War, 1920". Past and Present. 38 (38): 126–152. doi:10.1093/past/38.1.126.
^"21st July 1920: Expulsions from Harland & Wolff". Decade of Centenaries: Ulster 1885-1925. Retrieved 29 November 2018.
^Results of Fifth Aerial Derby at Hendon Flight: 29 July 1920, p.833.
^Robertson, Patrick (1974). The Shell Book of Firsts. London: Ebury Press. p. 203. ISBN 0-7181-1279-2.
^"1st World Jamboree". The Pine Tree Web. 1998. Archived from the original on 14 May 2011. Retrieved 23 February 2011.
^O'Farrell, Patrick (2004). "Mannix, Daniel (1864–1963)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/55446. Retrieved 11 November 2011. (Subscription or UK public library membership required.)
^ abcdCottrell, Peter (2009). The War for Ireland, 1913–1923. Oxford: Osprey Publishing. ISBN 978-1-84603-9966.
^"English Division Three (South) results on 28th August 1920 - Statto.com". Archived from the original on 5 October 2015. Retrieved 23 April 2011.
^"Official Southport Website - History". Archived from the original on 20 June 2013. Retrieved 23 April 2011.
^Georgano, N. (2000). Beaulieu Encyclopedia of the Automobile. London: HMSO. ISBN 1-57958-293-1.
^Hibbert, Christopher (1988). The Encyclopædia of Oxford. London: Macmillan. p. 427. ISBN 0-333-39917-X.
^ abPenguin Pocket On This Day. Penguin Reference Library. 2006. ISBN 0-14-102715-0.
^ abWilliams, Hywel (2005). Cassell's Chronology of World History. London: Weidenfeld & Nicolson. pp. 488–490. ISBN 0-304-35730-8.
^Cooper, Charlie (24 June 2014). "Britons are forced to tighten their belts". The Independent. London. p. 17. Archived from the original on 1 May 2022. Retrieved 24 June 2014.
^"Trail-blazers who pioneered women's football". BBC News. 3 June 2005. Retrieved 19 February 2010.
^Blastland, Michael (2 February 2012). "Go Figure: When was the real baby boom?". BBC News Magazine. Retrieved 5 February 2012.
^Walker, Andrew (29 January 2003). "Profile: King George VI". BBC News.
^"Huddersfield History". Huddersfield Local History Society. Archived from the original on 18 August 2013. Retrieved 23 December 2021.
^Barker, Dennis (7 November 2012). "Clive Dunn obituary". The Guardian. Retrieved 3 August 2023.