8 February 2015 marked the 200th anniversary of the birth of Thomas Erskine May. May is the most famous of the fifty holders of the office of Clerk of the House of Commons. His continued renown arises from his Treatise upon the Law, Privileges, Proceedings and Usage of Parliament, first published in 1844 and with its 25th edition currently in preparation. It is known throughout those parts of the world that model their constitutional arrangements...