In flashbacks, the audience is shown a young Margaret Roberts working at the family tobacconist's shop in Grantham, listening to the political speeches of her father, whom she idolised – it is also hinted that she had a poor relationship with her mother, a housewife – and announcing that she has won a place at Somerville College, Oxford. She remembers her struggle, as a young lower-middle class woman, to break into a snobbish male-dominated Conservative Party and find a seat in the House of Commons, along with businessman Denis Thatcher's marriage proposal to her. Her struggles to fit in as a "Lady Member" of the House, and as Education Secretary in Edward Heath's Cabinet are also shown, as are her friendship with Airey Neave, her decision to stand for Leader of the Conservative Party and eventual victory, and her voice coaching and image change.