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Edwin Abbott Abbott – Headmaster of the school (after whom Abbot house is named), theologian and author (Notable Old Citizens)
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David Lindo Alexander – Jewish community leader (Notable Old Citizens)
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Joe Alwyn – actor (Notable Old Citizens)
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Kingsley Amis – Writer (Notable Old Citizens)
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William Anderson – Physician, Anatomy professor and scholar of Japanese Art (Notable Old Citizens)
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Michael Apted – Actor, Producer and Director (Notable Old Citizens)
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Thomas Walker Arnold – Orientalist (Notable Old Citizens)
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Lord Ashby – Botanist and university chancellor (Notable Old Citizens)
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H. H. Asquith – Prime Minister 1908–1916 (Notable Old Citizens)
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Roy Baker - Film director (Notable Old Citizens)
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Julian Barnes - Novelist (Notable Old Citizens)
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Jonathan Barnes – Philosopher (Notable Old Citizens)
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Aaron Barschak – Comedian (Notable Old Citizens)
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Henry Charles Beeching – Poet (Notable Old Citizens)
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Samuel L Bensusan – author and expert on country matters (Notable Old Citizens)
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David Blundy – War Correspondent, killed in El Salvador, 17 November 1989 (Notable Old Citizens)
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Bramwell Booth – General of the Salvation Army (Notable Old Citizens)
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Mike Brearley – Cricketer, captain of the England cricket team 1977–1981 and whose father Horace Brearley taught at CLS (Notable Old Citizens)
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Clive Brooks – member of the band Egg (Notable Old Citizens)
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Arthur Henry Bullen – Publisher and scholar (Notable Old Citizens)
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Kenneth Callow – Biochemist (Notable Old Citizens)
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Mont Campbell – Member of the band Egg (Notable Old Citizens)
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Suma Chakrabarti – Senior Civil Servant (Notable Old Citizens)
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Lord Chalmers – Colonial governor and minister (Notable Old Citizens)
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Sir Paul Chambers – Industrialist, Chairman of ICI (Notable Old Citizens)
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Danny Cohen – New Controller of BBC One, and formerly of BBC Three (Notable Old Citizens)
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Lord Collins – Supreme Court justice (Notable Old Citizens)
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Robert Seymour Conway – Classical scholar and philologist (Notable Old Citizens)
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Jim Cousins – Labour MP (Notable Old Citizens)
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Jack Crawford – Professional NFL Player, Oakland Raiders (Notable Old Citizens)
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Philip Dawid – Statistician (Notable Old Citizens)
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John Diamond – Journalist and broadcaster, & Sunday Times writer (Notable Old Citizens)
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Edward Divers – Chemist (Notable Old Citizens)
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Lord Evans – Royal physician (Notable Old Citizens)
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Stewart Farrar – Author (Notable Old Citizens)
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John Knight Fotheringham – Historian, an expert on ancient astronomy and chronology (Notable Old Citizens)
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Percy Gardner – Archaeologist (Notable Old Citizens)
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Edward Garnett – Editor and writer (Notable Old Citizens)
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Leo Genn – Stage and film actor (Notable Old Citizens)
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Roland Glasser – literary translator (Notable Old Citizens)
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Israel Gollancz – Founding member of the British Academy (Notable Old Citizens)
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Theodore Bayley Hardy – Victoria Cross holder (Notable Old Citizens)
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Sam Hield Hamer – editor and writer (Notable Old Citizens)
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Sir Nicholas John Hannen, Chief Justice of the British Supreme Court for China and Japan and British Consul General, Shanghai (Notable Old Citizens)
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Marc Henrie – Photographer of Cats and Celebrities (Notable Old Citizens)
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Peter Higgs – Nobel Prize–winning theoretical physicist, predicted the so-called "God Particle" known as the Higgs boson (Notable Old Citizens)
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Frederick Hopkins – Nobel prize winning biochemist (Notable Old Citizens)
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Paul Hough – Film Director (Notable Old Citizens)
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William Huggins – Astronomer (Notable Old Citizens)
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Joseph Oscar Irwin – Statistician (Notable Old Citizens)
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Steven Isserlis – Cellist (Notable Old Citizens)
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Benedict Jacka – Novelist (Notable Old Citizens)
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Tim Jackson – Entrepreneur and author (Notable Old Citizens)
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Anthony Julius – Lawyer (Notable Old Citizens)
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Skandar Keynes – Film Actor (Notable Old Citizens)
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Ralph Knott – Architect (Notable Old Citizens)
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Peter B. Kronheimer – Mathematician (Notable Old Citizens)
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James Leasor – Author (Notable Old Citizens)
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Sidney Lee – Editor of the Dictionary of National Biography (Notable Old Citizens)
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Anthony Lester – Lawyer (Notable Old Citizens)
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Peter Levene – Chairman of Lloyd's of London and Lord Mayor of London 1998 & 1999 (Notable Old Citizens)
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Joseph Hiam Levy (Notable Old Citizens)
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David M. Lewis – Professor of Ancient History, University of Oxford (Notable Old Citizens)
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Sir Patrick Linstead – Chemist and Rector of Imperial College London (Notable Old Citizens)
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David Litman – American Entrepreneur, founder of hotels.com (Notable Old Citizens)
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Ernest Lough – Boy soprano, singer, whose recording of Mendelssohn's "O for the Wings of a Dove" with the Temple Choir in 1927 made him world-famous; it had sold one million copies by 1962, the first classical record to reach this figure. (Notable Old Citizens)
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Sir Wylie McKissock – neurosurgeon (Notable Old Citizens)
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Luke McShane – Chess Grandmaster (Notable Old Citizens)
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Lord Mishcon – Solicitor and politician who represented Princess Diana in her divorce. Home affairs spokesman in the House of Lords from 1983–1990 and shadow Lord Chancellor 1990–1992. (Notable Old Citizens)
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Neil Morisetti – UK Climate and Energy Security Envoy (Notable Old Citizens)
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Max Newman – mathematician and World War II codebreaker (Notable Old Citizens)
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George Newnes – publisher and editor (Notable Old Citizens)
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Denis Norden – Writer and broadcaster (Notable Old Citizens)
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Richard Packer – Senior Civil Servant (Notable Old Citizens)
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Howard John Stredder Pearce – Former Governor of the Falkland Islands and Civil Commissioner of South Georgia and the South Sandwich Islands (SGSSI) (Notable Old Citizens)
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Mark Pears, British billionaire, CEO of William Pears Group (Notable Old Citizens)
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Sir William Henry Perkin FRS – Chemist best known for his discovery of the first aniline dye mauveine at the age of 18. (Notable Old Citizens)
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Henry Thomas Herbert Piaggio – Physicist (Notable Old Citizens)
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Arthur Rackham – Illustrator (Notable Old Citizens)
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Daniel Radcliffe – Actor in the Harry Potter series of film adaptations. (Notable Old Citizens)
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Gervais Rentoul – Politician and first chairman of the 1922 Committee (Notable Old Citizens)
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Charles Thomson Ritchie – Chancellor of the Exchequer 1902–1903 (Notable Old Citizens)
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Joshua Rose – England Hockey Player and Comedian (Notable Old Citizens)
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Edward Linley Sambourne – Punch cartoonist (Notable Old Citizens)
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Michael Schwab – Professor of Public Health (Notable Old Citizens)
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John Robert Seeley – Historian and essayist (Notable Old Citizens)
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John Shrapnel – Film and stage actor (Notable Old Citizens)
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Bernard Silverman FRS- Former Master of St Peter's College, Oxford, and Chief Scientific Adviser to the Home Office (Notable Old Citizens)
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William Johnson Sollas, geologist and anthropologist (Notable Old Citizens)
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Dave Stewart – Keyboardist with the bands Uriel, Egg, Hatfield and the North, National Health, Bruford and Stewart / Gaskin. (Notable Old Citizens)
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Edward Stanford – Mapmaker (Notable Old Citizens)
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Alfred Sutro – Playwright (Notable Old Citizens)
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Derek Taunt – Mathematician and cryptologist (Notable Old Citizens)
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Sir Thomas Taylor – Chemist, academic, and university administrator. (Notable Old Citizens)
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John Lawrence Toole – Actor and theatre manager (Notable Old Citizens)
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Thomas Fisher Unwin – Publisher (Notable Old Citizens)
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David Walker – Master of the Household (Notable Old Citizens)
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Alan Arthur Wells – Structural engineer, developer of Wells turbine (Notable Old Citizens)
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Sir Robert Stanford Wood First Vice Chancellor of the University of Southampton (Notable Old Citizens)
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