Nearly a month after the resignation of Keir Starmer, former Manchester Mayor Andy Burnham, one of the most popular politicians in Britain, has become the country's seventh prime minister in 10 years.

The move was made possible after Burnham won a by-election in the Makerfield constituency by a wide margin. He was then appointed as the leader of the ruling Labour Party on Friday, confirming him as Starmer's successor.

UK Prime Minister Keir Starmer quitsTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video

A long political career

"Everyone can feel the country isn't where it should be," 56-year-old Burnham said after his Makerfield election victory, in remarks that already sounded distinctly prime ministerial. "From here on I will give everything I have got to make it so. To ensure the name Makerfield is forever synonymous with bringing about the change this country needs, bringing back something we've lost ― hope ― hope for the future."