Harriet Harman has been named as acting leader of the Labour Party within minutes of Gordon Brown standing down as prime minister.
Ms Harman was Labour's deputy leader and leader of the House of Commons in the last government.
She ruled herself out of the running to replace Mr Brown when he announced he planned to quit as Labour leader.
She is the second woman to lead the party. Margaret Beckett was acting leader after John Smith's 1994 death.