Shadow Cabinet of Margaret Thatcher
became the first female Leader of the Conservative Party and Leader of the Opposition after winning the 1975 leadership election, the first Conservative leadership election where the post was not vacant. A rule change to enable the election was largely prompted by dissatisfaction with the incumbent leader, Edward Heath, who had lost three of four general elections as leader, including two in 1974. After announcing her first Shadow Cabinet in February 1975, she reshuffled it twice: in January and November 1976. Minor subsequent changes were necessary to respond to various circumstances. Thatcher's Shadow Cabinet ceased to exist upon her becoming Prime Minister following the 1979 general election.
Shadow Cabinet list
Initial Shadow Cabinet
Thatcher announced her first Shadow Cabinet on 18 February 1975.- Margaret Thatcher – Leader of Her Majesty's Most Loyal Opposition and Leader of the Conservative Party
- William Whitelaw – Deputy Leader of the Opposition and Shadow Minister responsible for Devolution
- Keith Joseph – Shadow Minister with responsibility for policy formation and research
- Lord Hailsham of St Marylebone – Shadow Minister without portfolio
- Reginald Maudling – Shadow Secretary of State for Foreign and Commonwealth Affairs
- Geoffrey Howe – Shadow Chancellor of the Exchequer
- Ian Gilmour – Shadow Secretary of State for the Home Department
- Lord Carrington – Leader of the Opposition in the House of Lords
- Jim Prior – Shadow Secretary of State for Employment
- Francis Pym – Shadow Minister of Agriculture, Fisheries and Food
- Patrick Jenkin – Shadow Secretary of State for Energy
- John Peyton – Shadow Leader of the House of Commons
- Norman St John-Stevas – Shadow Secretary of State for Education and Science and Shadow Minister for the Arts
- Michael Heseltine – Shadow Secretary of State for Industry
- Timothy Raison – Shadow Secretary of State for the Environment
- Alick Buchanan-Smith – Shadow Secretary of State for Scotland
- Nicholas Edwards – Shadow Secretary of State for Wales
- Airey Neave – Shadow Secretary of State for Northern Ireland
- George Younger – Shadow Secretary of State for Defence
- Norman Fowler – Shadow Secretary of State for Health and Social Services
- Sally Oppenheim – Shadow Secretary of State for Prices and Consumer Protection
- Humphrey Atkins – Opposition Chief Whip in the House of Commons
- Lord St Aldwyn – Opposition Chief Whip in the House of Lords
- Sir Michael Havers – Shadow Attorney General
- April 1975: Due to illness, Pym was replaced as Shadow Agriculture Minister by Michael Jopling.
January 1976 reshuffle
- Margaret Thatcher – Leader of Her Majesty's Most Loyal Opposition and Leader of the Conservative Party
- William Whitelaw – Deputy Leader of the Opposition, Shadow Secretary of State for the Home Department and Shadow Minister responsible for Devolution
- Keith Joseph – Shadow Minister with responsibility for policy formation and research
- Lord Hailsham of St Marylebone – Shadow Minister without portfolio
- Reginald Maudling – Shadow Secretary of State for Foreign and Commonwealth Affairs
- Geoffrey Howe – Shadow Chancellor of the Exchequer
- Ian Gilmour – Shadow Secretary of State for Defence
- Lord Carrington – Leader of the Opposition in the House of Lords
- James Prior – Shadow Secretary of State for Employment
- Francis Pym – Shadow Minister of Agriculture, Fisheries and Food
- John Biffen – Shadow Secretary of State for Energy
- John Peyton – Shadow Leader of the House of Commons
- Norman St John-Stevas – Shadow Secretary of State for Education and Science
- Michael Heseltine – Shadow Secretary of State for Industry
- Timothy Raison – Shadow Secretary of State for the Environment
- Alick Buchanan-Smith – Shadow Secretary of State for Scotland
- Nicholas Edwards – Shadow Secretary of State for Wales
- Airey Neave – Shadow Secretary of State for Northern Ireland
- Patrick Jenkin – Shadow Secretary of State for Health and Social Services
- Sally Oppenheim – Shadow Secretary of State for Prices and Consumer Protection
- Humphrey Atkins – Opposition Chief Whip in the House of Commons
- Lord St Aldwyn – Opposition Chief Whip in the House of Lords
- Sir Michael Havers – Shadow Attorney General
November 1976 reshuffle
- Margaret Thatcher – Leader of Her Majesty's Most Loyal Opposition and Leader of the Conservative Party
- William Whitelaw – Deputy Leader of the Opposition and Shadow Secretary of State for the Home Department
- Keith Joseph – Shadow Minister with responsibility for policy formation and research
- Lord Hailsham of St Marylebone – Shadow Minister without portfolio
- John Davies – Shadow Secretary of State for Foreign and Commonwealth Affairs
- Geoffrey Howe – Shadow Chancellor of the Exchequer
- Ian Gilmour – Shadow Secretary of State for Defence
- Lord Carrington – Leader of the Opposition in the House of Lords
- James Prior – Shadow Secretary of State for Employment
- John Peyton – Shadow Minister of Agriculture, Fisheries and Food
- Tom King – Shadow Secretary of State for Energy
- Francis Pym – Shadow Leader of the House of Commons and Shadow Minister responsible for Devolution
- Norman St John-Stevas – Shadow Secretary of State for Education and Science and Shadow Minister for the Arts
- John Biffen – Shadow Secretary of State for Industry
- Michael Heseltine – Shadow Secretary of State for the Environment
- Alick Buchanan-Smith – Shadow Secretary of State for Scotland
- Nicholas Edwards – Shadow Secretary of State for Wales
- Airey Neave – Shadow Secretary of State for Northern Ireland
- Patrick Jenkin – Shadow Secretary of State for Health and Social Services
- Sally Oppenheim – Shadow Secretary of State for Prices and Consumer Protection
- Humphrey Atkins – Opposition Chief Whip in the House of Commons
- Lord St Aldwyn – Opposition Chief Whip in the House of Lords
- Sir Michael Havers – Shadow Attorney General
- 9 December 1976: Buchanan-Smith is sacked as Shadow Scottish Secretary for failing to adhere to collective responsibility on devolution policy and is replaced by Teddy Taylor, who had been Shadow Trade Secretary, a role that appears not to have belonged to the Shadow Cabinet at this point.
- Approx. 17 January 1978: Lord St Aldwyn retires as Conservative Chief Whip and is replaced by Lord Denham.
- November 1978: On 6 November, John Davies retires from public life after being diagnosed with a brain tumor. Pym is tapped to stand in for him, and is later given the post of Shadow Foreign Secretary full-time. St John-Stevas replaces him Shadow Leader of the House, and Mark Carlisle replaced the latter as Shadow Education Secretary.
- March 1979: Shadow Northern Ireland Secretary Airey Neave is killed by an Irish National Liberation Army car bomb, just over a week before Parliament is dissolved ahead of the 1979 general election.