Born at St Albans, Herts, 18 June 1903, the second child and only son of F T W Cubitt, grain merchant and Jessie S Sanderson his wife. He was educated at St George's School, Harpenden, and graduated BA from Wadham College, Oxford, after gaining a second class in physiology in the natural science school in 1924. He received his medical education at King's College Hospital, where he served as house physician, and was subsequently house surgeon at the West London Hospital. He was for a time resident surgical officer at the Gloucester Royal Infirmary, and afterwards surgical registrar at the Middlesex Hospital. He died unmarried at Budapest, Hungary on 3 May 1938 aged 34.