Andy Burnham will replace Keir Starmer as UK prime minister following Labour's leadership contest.

Andy Burnham will, on Monday, become Britain's seventh prime minister to move into Downing Street since January 2016, with an in-tray overflowing with challenges and little time to make his mark.

The new leader takes over from the unpopular Keir Starmer just two years after the outgoing prime minister led Labour to power in a landslide election victory after 14 years of Conservative rule.

After being asked by King Charles III to form the next government, Burnham, 56, is due to make his first speech Monday outside 10 Downing Street shortly after Starmer has said his farewells.

In an interview with The Times published late Sunday, Burnham set out his ambition for change, saying he wanted to draw a line under a decade of political turmoil.