In 1940, Domvile was implicated as a participant in a fascist plot, organized by Leigh Vaughan-Henry, against the British government. Vaughan-Henry was reported to have already organized 18 cells of 25 members each for the coup, which was intended to take place when Germany landed in Britain. He was also implicated in another plot organized by
Archibald Maule Ramsay, the founder of the Right Club. In June 1940, Domvile's mistress, Olive Baker, was arrested for distributing leaflets promoting
Reichssender Hamburg. She tried to commit suicide in prison and was sentenced to five years' imprisonment. Domvile himself was
interned during
Second World War under
Defence Regulation 18B from 7 July 1940 to 29 July 1943. During his wartime captivity, he wrote an autobiographical memoir,
From Admiral to Cabin Boy. It was first published in 1947 and republished in 2008. ==Later life==