Lupton was the only surviving son of Charles Lupton, solicitor and co-founder of the law firmDLA Piper, alderman, and Lord Mayor of Leeds 1915–16, and his wife Katharine, of Carr Head, Roundhay. His mother was the fourth daughter of Thomas Ashton,, of Ford Bank, Didsbury, Manchester, two of whose sons were Thomas Gair Ashton MP, who became Lord Ashton of Hyde, and Samuel Edgar Ashton. Lupton was educated at Hillbrow and Rugby Schools, leaving the latter in July 1916, before he was 18, to join the Royal Naval Air Service. He was commissioned as a temporary flight sub-lieutenant on 20 July 1916, and was granted Royal Aero Club Aviator's Certificate No. 3734, flying a Maurice Farman biplane at RNAS Eastbourne, on 14 September 1916. He first served at home stations, and at Prawle Point in April 1917 he met with a serious accident which incapacitated him for two months. He was sent to Dunkirk in August 1917, when posted to No. 5 Squadron flying the Airco DH.4 two-seater day bomber. Lupton gained his first victory on 28 September, driving down out of control an Albatros D.V over Blankenberge, and repeated the feat on 8 December over Aertrycke airfield. His crewman for both was Aerial Gun Layer Smith, and the second victory was shared with Flight Sub-LieutenantJohn Gamon and AGL Winter. On 18 December 1917 he and two other officers were awarded the Distinguished Service Cross for their part in an bombing raid. The citation read: Lupton was promoted to flight lieutenant on 31 December 1917, and was appointed an acting flight commander in January 1918. In March his squadron moved further south, and on the 22nd of that month Lupton, now flying with AGL A. G. Wood, drove down another Albatros D.V south-west of Vendhuile. He was awarded a second Distinguished Service Cross, which was gazetted posthumously on 4 June 1918. His citation read: When the Royal Naval Air Service and the Army's Royal Flying Corps were merged to form the Royal Air Force on 1 April, Lupton was promoted to captain, and No. 5 Squadron became No. 205 Squadron RAF. A week later, on 6 April 1918, he sent a Fokker Dr.I down in flames north-east of Villers-Bretonneux, and the following day drove down a Pfalz D.III over Lamotte. Lupton was killed in action, after colliding with a French aircraft at an altitude of, while returning from a raid over the German lines, on 9 May 1918. He was 20 years old. He is buried at the British Cemetery at Vignacourt, and commemorated on the memorial in St Johns Church, Roundhay.
