When Did Harold Siddons Die?

William Harold Henry Siddons was a British film and television actor, appearing in Genevieve, The Dam Busters, Appointment in London, They Who Dare, The Purple Plain, Quatermass and the Pit, A Night To Remember and The Wrong Arm of the Law. He served in Bomber Command during the Second World War as a flight engineer, latterly with 582 Squadron as the Flight Engineer Leader on its formation in April 1944 and was a descendant of Sarah Siddons.