Mark Henderson answered
Margaret Thatcher (1925 - ) was not the longest-serving British Prime Minister. Sir Robert Walpole was both the first and the longest-serving Prime Minister, and held office for 20 years in the 18th Century.
Margaret Thatcher is however the longest-serving British Prime Minister of the 20th century and the fifth longest-serving of all time. She is also the only woman to have ever held the post.
Thatcher was elected as MP for Finchley in April 1959 and in 1970 she was appointed the Secretary of State for Education and Science. Labour won the 1974 general election and, following this, Thatcher become the Leader of the Opposition.
Margaret Thatcher was elected Prime Minister in the 1979 general election and during her Premiership she presided over economic deregulation, privatization, the miner's strike and the Falklands War.
Top 5 longest-serving British Prime Ministers
1. Sir Robert Walpole (20 years, 314 days)
Margaret Thatcher is however the longest-serving British Prime Minister of the 20th century and the fifth longest-serving of all time. She is also the only woman to have ever held the post.
Thatcher was elected as MP for Finchley in April 1959 and in 1970 she was appointed the Secretary of State for Education and Science. Labour won the 1974 general election and, following this, Thatcher become the Leader of the Opposition.
Margaret Thatcher was elected Prime Minister in the 1979 general election and during her Premiership she presided over economic deregulation, privatization, the miner's strike and the Falklands War.
Top 5 longest-serving British Prime Ministers
1. Sir Robert Walpole (20 years, 314 days)
- In office: 4th April 1721 - 11th February 1742.
- Party: Whig.
- Monarch: George I, George II.
- Succeeded by: Spencer Compton.
- In office: 19th December 1783 - 14th March 1801.
- Party: Tory.
- Monarch: George III.
- Succeeded by: Henry Addington.
- In office: 8th June 1812 - 9th April 1827.
- Party: Tory.
- Monach: George IV.
- Succeeded by: George Canning.
- In office: 28th January 1770 - 22nd March 1782.
- Party: Tory.
- Monarch: George III.
- Succeeded by: Charles Watson-Wentworth.
- In office: 4th May 1979 - 28th November 1990.
- Party: Tory.
- Monarch: Queen Elizabeth II
- Succeeded by: John Major.