Did Britain have a homing torpedo during World War II?
Short answerBritain worked on the technology and participated in Allied development, but did not field its own wartime homing torpedo before the postwar Mark 30.
NotesThe answer distinguishes wartime research from a fielded indigenous weapon. British scientists participated in the Allied effort while the United States moved a weapon toward operational use. That cooperation reduced the need to rush a separate British system into service during the war. The postwar Mark 30 marks the later point at which Britain fielded its own homing torpedo rather than evidence of a wartime deployment.