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
Records of Prime Ministers of the United Kingdom only Prime Minister ever to do so. Others who died within the same year they were Prime Minister were the Duke of Portland who died in 1809, 26 days after he left office and Neville Chamberlain, who died in 1940, six months (less a day) after he left office, of a cancer that was undiagnosed at the time of his resignation. Nine Prime Ministers have died while their immediate successor was in office: All of the above-listed Prime Ministers were older than their immediate successors. The Duke of Portland and Lord Aberdeen are the only ones among this list who