Prime minister leader, the incoming leader will usually be referred as "prime minister-in-waiting". An example or this situation was in 2016 in the United Kingdom when Theresa May was elected leader of the Conservative Party while David Cameron was still prime minister. Ukraine's constitution (1996) lists the powers, functions and duties of the Prime Minister of Ukraine. Most prime ministers in parliamentary systems are not appointed for a specific term in office and in effect may remain in power through a number of elections and parliaments. For example, Margaret Thatcher was only ever appointed prime minister on "one" occasion, in 1979. She
Prime Minister of the United Kingdom Prime Minister's powers and relationships with other institutions still largely continue to derive from ancient royal prerogatives and historic and modern constitutional conventions. Prime Ministers continue to hold the position of First Lord of the Treasury and, since November 1968, that of Minister for the Civil Service, the latter giving them authority over the civil service. Under this arrangement, Britain might appear to have two executives: the Prime Minister and the Sovereign. The concept of "the Crown" resolves this paradox. The Crown symbolises the state's authority to govern: to make laws and execute them, impose taxes and collect them, declare