Born on 21 September 1891 the son of J T Riddiough of Bradford, he was educated at Bradford Grammar School and King's College, Cambridge, where he was an exhibitioner. Having obtained second-class honours in the Natural Sciences Tripos in 1912 and in the Mathematical Tripos in 1913, he became a master at the Leys School, but shortly afterwards he decided to study medicine at Guy's Hospital. Qualifying in 1917, he graduated BChir, MB in 1919 and after qualification he held the appointments of out-patients officer at Guy's Hospital and house physician at Addenbrooke's Hospital, Cambridge. After a period in the RAMC when he was attached to the Highland Light Infantry on active service in France, he returned to Guy's to become chief clinical assistant in the department of neurology. In 1923 he entered general practice at Dewsbury, Yorks, joining the staff of the General Infirmary as an assistant surgeon. When he left in 1931, having become a Fellow, he was appointed honorary surgeon to the Infirmary. In 1932 he settled in consulting practice in Cambridge, where he remained for the rest of his life. He was consulting surgeon to Addenbrooke's Hospital, Huntingdon County Hospital, and Royston Cottage Hospital, and consulting urologist to Peterborough Memorial Hospital. Riddiough was a Freemason and held the rank of deputy provincial grand master of Cambridgeshire and was past grand deacon of England. Active in public life he was a member of the council of the borough of Cambridge, and also of the Cambridgeshire County Council. Of a genial disposition, he was an after-dinner speaker and raconteur of considerable note. He did not marry. Riddiough died on 7 January 1959 aged 67; the funeral was at Holy Trinity, Cambridge. He lived at 67 Bridge Street, Cambridge.