Mrs. Ros Pritchard, a supermarket manager decides to run for political office. As she begins her campaign, other women follow her lead. Meanwhile, her daughter, Emily breaks up a wedding. Ros wins the election, but then realizes she has no experience. Her husband Ian thinks she should step down. The Queen tries to persuade Ros to stay and her supporters, Catherine and Miranda put together a cabinet.
Ros is nervous about invoking an Act of Parliament to push through her Reform Bill. Then she must tell a visiting African President that his family has been assassinated. Catherine sleeps with Ben, a young policy advisor, but is appalled when he admits he's in love with her. Emily poses naked for a men's magazine. Georgina gets a boyfriend and it makes school life better for her. Ian admits to Emily that he's been laundering money.
After a year in office, Ros is feeling confident in her abilities. Then a plane crashes over East London and the country fears a terrorist attack. Emily worries that her father will end up in prison for his money laundering. Miranda learns that Emily dropped out of school and tries to get Kitty to give her a job. When Beverley is photographed stumbling drunk out of a bar, she tries to resign, but Ros refuses to accept her resignation.
Ros surprises her staff by announcing at a press conference that she is going to implement a ban on cars every Wednesday. Ros tries to make time for her family in her busy schedule, but on the day she picks, none of her family is available. Emily goes on a celebrity program set in the jungle. Ian leaves Ros to reassess their marriage. Catherine has a pregnancy scare and Ros learns that Hilary is leaking information to a biographer.
Ros learns about Ian's past money laundering and struggles with the decision about whether or not to tell the public.