Records of Prime Ministers of the United Kingdom of . From oldest to youngest: The most recent death of a former Prime Minister was that of Baroness Thatcher (served 1979–90) on 8 April 2013 (aged 87 years, 177 days). Seven Prime Ministers have died in office: Spencer Perceval is the only British Prime Minister to have been assassinated. Sir Robert Peel, Margaret Thatcher and John Major survived assassination attempts in 1843, 1984 and 1991 respectively. Sir Henry Campbell-Bannerman and Bonar Law each resigned during their respective final illnesses. Law died five months after his resignation, but Campbell-Bannerman lived only another 19 days, dying at 10 Downing Street, the
Historical rankings of Prime Ministers of Canada Historical rankings of Prime Ministers of Canada Historical rankings of Canadian prime ministers are surveys conducted in order to construct rankings of the success of individuals who have served as Prime Minister of Canada. Ranking systems are usually based on surveys of academic historians, economists and political scientists. The rankings focus on the achievements, leadership qualities, failures and faults in office. "Note: Click the "sort" icon at the head of each column to view the rankings for each survey in numerical order." Sequence listed by first term as Prime Minister <nowiki>*</nowiki> Ranking calculated before the prime minister had left office