During the First World War he served on the Western Front and was promoted to lieutenant in October 1915 and to captain in November 1917.

Following the recommendation of the Medical Board, he was granted permission by the War Office to travel to the United States during his leave in 1916.

[2] After the war he became a stockbroker, dealing mostly in gold and diamond shares from South Africa,[1] and was a member of the London Stock Exchange.

Closed since 1940 due to the Blitz, the Prince Edward Theatre re-opened in 1942 as the Queensberry All-Services Club, where servicemen and women could enjoy dancing, table tennis, billiards, chess, and variety shows.

[1] He wrote two books relating to his family history: The Sporting Queensberrys (1942) and with Percy Colson, Oscar Wilde and the Black Douglas (1949).

[6] The couple had two children: His third wife was Muriel Beatrice Margaret Chunn (known as "Mimi"), daughter of Arthur John Rowe Thornett of Monte Carlo,[3] and former wife of Albert Sydney Gore Chunn.