The former mayor of Greater Manchester was the only contender in the center-left party's leadership contest to replace departing Prime Minister Keir Starmer, who was forced out by a rebellion within his party.

Andy Burnham has been officially declared leader of Britain’s governing Labour Party, clearing his final hurdle to taking office as prime minister next week.

Burnham is expected to deliver a speech on Friday where he will reportedly pledge to be "unashamedly Labour" and vow that his government will have the "courage to fix the big…