Larry the Cat, at home on Downing Street

One of the most famous addresses in the world, 10 Downing Street in London, is home not just to prime ministers, but also to a 19-year-old tabby cat named Larry. Correspondent Holly Williams looks at how the official pet of the British leader's residence and Chief Mouser to the Cabinet Office has become a favorite of the press – and a political fixture whose nine lives have so far outlasted six prime ministers.