Margaret Thatcher
Conservative Prime Minister of the United Kingdom from 1979 to 1990.
Keir Starmer's resignation on 22 June 2026, after Labour MPs privately judged he could not win again, revived Margaret Thatcher's exit of November 1990 as its closest precedent: she quit before a second leadership ballot once Cabinet colleagues said she would lose.
Last refreshed: 7 October 2026
Timeline for Margaret Thatcher
Mentioned in: Labour takes Hirst and Amble from Reform
UK Local Elections 2026Mentioned in: Carol Ney quits Reform over a post
UK Local Elections 2026Mentioned in: Starmer quits as PM and Labour leader
UK Local Elections 2026Mentioned in: Health Sec Streeting walks on Starmer
UK Local Elections 2026Background
Margaret Thatcher led the Conservative Party from 1975 and served as Prime Minister from May 1979 until November 1990, carrying the general elections of 1979, 1983 and 1987. The 1983 landslide came on a smaller Conservative share, because Labour and the SDP-Liberal Alliance divided the opposition vote nearly evenly.
In 1980 her government ended the link between the state pension and earnings, and the Local Government Act 1985 did away with the Greater London Council and the six metropolitan county councils. Her premiership closed in November 1990, when Cabinet colleagues told her she would lose a second leadership ballot and she resigned instead.
She sat in The House of Lords as Baroness Thatcher from 1992 and died in April 2013. Her 1983 result is still the usual illustration of First past the post rewarding a united side against a split one.
Her 1990 exit became the template
Thatcher's fall was the precedent most often cited as Keir Starmer's premiership came apart in 2026. Geoffrey Howe's resignation as Deputy Prime Minister had set off the 1990 Conservative contest that ended her tenure, and Wes Streeting's walkout as Health Secretary on 14 May 2026, the first Cabinet departure of Labour's crisis, was read in the same light.
She led the first ballot in November 1990 but fell short of the margin needed to avoid a second, and withdrew after Cabinet ministers told her one at a time that she could not win. Starmer followed that sequence on 22 June 2026, resigning once he accepted the Parliamentary Labour Party's private verdict rather than facing a vote.