Prime Minister of the United Kingdom century as a convention of the constitution, the position of Leader of the Opposition was given statutory recognition in 1937 by the Ministers of the Crown Act. British Prime Ministers have never been elected directly by the public. A Prime Minister need not be a party leader; David Lloyd George was not a party leader during his service as prime Minister during World War I, and neither was Ramsay MacDonald from 1931 to 1935. Prime Ministers have taken office because they were members of either the Commons or Lords, and either inherited a majority in the Commons or won more
Prime Minister of Canada with the augmentation. Canada continues the Westminster tradition of using the title "Prime Minister" when one is speaking to the federal head of government directly; this is in contrast to the United States protocol of addressing the federal head of government as "mister" (as in, "Mister President"); the Department of Canadian Heritage advises that it is incorrect to use the term "Mr Prime Minister". The written form of address for the prime minister should use his or her full parliamentary title: "The Right Honourable [name], <nowiki>[</nowiki>post-nominal letters<nowiki>]</nowiki>, Prime Minister of Canada". However, while in the House of Commons during Question