Michael Heseltine resigns over Westland (1986)
Defence Secretary Michael Heseltine walked out of a cabinet meeting and quit over how the government handled the rescue of helicopter maker Westland. He accused Margaret Thatcher's team of stifling debate. The dispute mixed defence procurement with a fight over process.
The walkout damaged Thatcher and forced a second minister, Leon Brittan, to resign weeks later.
Heseltine returned to government in 1990 and later challenged Thatcher, helping end her leadership.
Like Healey, a defence secretary resigned on principle over how the government ran a major defence decision, wounding a sitting prime minister.
