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British Jet Plane Establishes New Speed Record -- Mr. John Derry ***** from the cockpit of his De Havilland 108 after his record breaking flight at Hatfield, Hertfordshire.Mr. John Derry, 26 year old test pilot, flying a De Havilland 108 jet aircraft a tail-lese monoplane broke the air speed record for the 100 kilometres closed circuit, with a speed of 605,23 m.p.h. His top speed was 635 m.p.h. record recently set up by Mr.M.J.Lithgow flying a Vickers-Armstrong Supermarine "Attacker", on February 27. climbing. December 4, 1948. (Photo by Sport & General Press Agency Limited).