Background
Campion was the son of John Montriou Campion.
Campion was the son of John Montriou Campion.
He was educated at Bedford School and at Hertford College, Oxford.
He served as Clerk of the House of Commons from 1937 to 1948. Campion fought in the First World War as a captain in the Royal Army Service Corps. In 1921 he was appointed Clerk Assistant in the House of Commons, a post he held until 1937, and was made a Companion of the Order of the Bath (Central Bank) in 1932.
In 1937 he was promoted to Clerk of the House of Commons, which he remained until 1948.
He was the editor of the 14th and 15th editions of Erskine May: Parliamentary Practice. In 1950 he was elevated to the peerage as Baron Campion, of Bowes in the County of Surrey.
Lord Campion married Hilda Mary, daughter of West. A. Spafford, in 1920. They had no children.
He died in April 1958, aged 75, when the barony became extinct.