At the opening of the film, the audience gets to see just how far the poor working conditions and sexism went in this British Ford plant in the 1960s, as all of the women are forced to work stripped down to their underwear, due to the extremely hot temperatures in the plant. When union steward Albert Passingham - played by famous British actor Bob Hoskins - arrives to see these conditions, he encourages them to take action against these progressive conditions and they agree. The women stage a ban on overtime and a walk-out protest to get the attention of their bosses. After celebrating their actions, they return to work to find that conditions have gotten even worse and the women decide to nominate Rita O'Grady and another worker to go and speak at a meeting at the Ford headquarters to further emphasize their strife.
However, before the meeting, Albert and Rita discover that the labor union is selling the women out and do not care about their plight. This leads Rita to kick up the protest a notch and the film continues to follow their fight for the same rights, pay and treatment as male employees. However, the battle takes a toll on Rita's personal life, leading to tensions growing with her husband, Eddie, back at home.