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Thomas Erskine May, 1st Baron Farnborough, KCB, PC was a British constitutional theorist and Clerk of the House of Commons.His seminal work, A Treatise upon the Law, Privileges, Proceedings and Usage of Parliament has become known as Erskine May: Parliamentary Practice or simply Erskine May: this parliamentary authority is currently in its 25th revised edition and is informally considered part of the constitution of the United Kingdom.