 More was educated at Eton College and King's College, Cambridge, becoming a barrister, called by Lincoln's Inn and Middle Temple in 1930.His career at the bar ended with the outbreak of World War II.He was a civilian employee of the Ministry of Economic Warfare and the Ministry of Aircraft Production and Light Metals Control until 1942, was commissioned as an Army legal officer on the General List in 1943, and was in Italy until 1945 and with the military government of the Dodecanese until 1946.