Most scripts she had been sent were poor, she said, and contemporary dramatists were not writing good roles for women. Moreover, she said, she had a hatred of a Conservative government which, inspired by “that dreadful woman Margaret Thatcher,” seemed to be dismembering the welfare state the Labour Party had created after the war.

In Parliament, Ms. Jackson took an interest in homelessness, housing, women’s rights, disability issues and, especially, transportation. After resigning from her transport post, she was a Labour backbencher, joining those who opposed Britain’s part in the Iraq war in 2003, declaring herself “deeply, deeply ashamed” of her government and calling for Prime Minister Tony Blair’s resignation.

Ms. Jackson and Mr. Hodges divorced in 1976. In later years she shared a London house with her only child, the political journalist Dan Hodges, and his wife and children. She preferred, she said, to remain unmarried, explaining that “men are awfully hard work for very little reward.”

Ms. Jackson also shunned the trappings of celebrity, dressing inexpensively, using public transportation and relegating her Oscars to the attic. She was, she admitted, a solitary person with not many friends.

But she did perhaps fulfill her own ambition: “If I have my health and strength, I’m going to be the most appalling old lady,” she said. “I’m going to boss everyone about, make people stand up for me when I come into a room, and generally capitalize on all the hypocrisy that society shows towards the old.”

Emma Bubola contributed reporting.