Milnes Coates baronets  The Coates, later Milnes Coates, baronetcy, of Helperby Hall in Helperby in the North Riding of the County of York, is a title in the Baronetage of the United Kingdom. It was created on 29 June 1911 for Edward Coates. He was a member of Coates, Son & Co, stockbrokers, and represented Lewisham in the House of Commons as a Conservative. The second Baronet married Lady Celia Hermione, daughter of Robert Crewe-Milnes, 1st Marquess of Crewe, in 1906, and assumed by deed poll the additional surname of Milnes in 1946. The fourth Baronet is Professor of Medical Microbiology at St George's Hospital Medical School, London.