Educated at Stonyhurst College,[1] Constable-Maxwell-Scott transferred from the militia into the Cameronians (Scottish Rifles) on 11 January 1899.

[2] He saw action in the Tirah campaign, the Second Boer War and the First World War for which he was appointed a Companion of the Distinguished Service Order,[3] and promoted to temporary brigadier general in January 1918.

[5] He inherited Abbotsford House on the death of his mother, Mary Monica Maxwell-Scott, in March 1920.

[6] He is buried immediately adjacent to the side wall of Walter Scott's grave at Dryburgh Abbey.

[1] Following the death of his first wife, he married Countess Marie Louise de Sincay, née Logan in June 1928.