Career
Duncan was a Director of the Bank of England and of Imperial Chemical Industries. He was chairman of the Central Electricity Board from 1927 to 1935, and chairman of the British Iron and Steel Federation from 1935 until 1945. He was re-elected at the 1945 election, stepped down at the 1950 general election and died in 1952.
During his time in ministerial office, there was some concern that someone so closely involved with the iron, steel and chemical industries was in charge of their regulation.
However, wartime pressures kept Duncan in post and he was undamaged. He returned to the Iron and Steel Federation after the war, working to resist the Labour government"s nationalisation plans with Aubrey Jones, his assistant, later a Conservative minister.
In addition to his service in the United Kingdom, Duncan was appointed in 1926 by Prime Minister of Canada Mackenzie King in response to the Maritime Rights Movement to chair the Royal Commission on Maritime Claims which was thus nicknamed the "Duncan Commission".