Andy Burnham addresses supporters outside the Labour Party campaign office on June 18, during his successful campaign to become elected as the member of Parliament for Makerfield. [Oli SCARFF / AFP]

Andy Burnham addresses supporters outside the Labour Party campaign office on June 18, during his successful campaign to become elected as the member of Parliament for Makerfield.…

The Greater Manchester mayor, known as the "King of the North," will replace Keir Starmer as Britain's prime minister after winning the Labour leadership.