Records of Prime Ministers of the United Kingdom combined with his first term (13 July 176530 July 1766) his total time in office was 1 year and 113 days, which exceeds the total periods of several other Prime Ministers. (The Duke of Wellington had also served as Prime Minister between 1828 and 1830.) Consequently, the Prime Minister with the total shortest period in office was George Canning, whose sole term lasted 119 days from 12 April 1827 until his death on 8 August 1827. The Prime Minister with the longest period between the start of their first appointment and the end of their final term was the Duke
Prime Minister of the United Kingdom powerful than the American presidents, as the Prime Minister is part of the legislature, and unlike presidents, can directly initiate legislation. Thus, Dowding argues that adding to these powers, makes the Prime Minister less like presidents, and that what Britain is witnessing is not presidentialisation but, increase in powers overtime, can be best explained as "Prime Ministerialisation" of British politics. Regarding the thesis, Dowding writes: "The presidentialisation of the Prime Minister thesis should be expunged from political science vocabulary, to the extent that the forces identified by those who pursue the thesis exist, they do not make the British Prime