Swan was eldest son of Nichol Allan Swan and Anne Gardener Keir. He was educated at Edinburgh Academy and entered farming in 1933.[1]
Military career
On 13 May 1939 he was commissioned into the King's Own Scottish Borderers of the Territorial Army.[2] He served with the 4th Battalion of the regiment in the Battle of France. Between 1942 and 1945 Swan was seconded to the British Indian Army and served with the No. 1 Mule Training Regiment in Jullundu. Following the end of the Second World War, Swan returned to farming in Scotland.[3]
He served as Army Cadet Force County Commandant for Roxburgh, Berwick and Selkirk from 1955 to 1973 and was granted the rank of lieutenant-colonel. He was a colonel in the Lowlands Territorial Army from 1983 to 1986.[4]
Agriculture
Swan was President of the National Farmers Union of Scotland from 1961 to 1962 and was President of the Scottish Agricultural Organisation Society from 1966 to 1968. He was a member of the Development Commission from 1964 to 1976.[5]