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
Historical rankings of Prime Ministers of the United Kingdom prime ministers were ranked in the top 100. Winston Churchill was voted greatest Briton, the Duke of Wellington was in 15th place (though not featured in contemporary polls as he was a 19th-century politician), Margaret Thatcher was in 16th place, Tony Blair was 67th and David Lloyd George was 79th. The BBC television programme "The Daily Politics" asked viewers in 2007 to select their favourite Prime Minister. Margaret Thatcher topped the list with 49% of the vote, with Clement Attlee coming second with 32%. Historical rankings of Prime Ministers of the United Kingdom "The Times" constructed a poll for the