Keir Starmer has announced his resignation as prime minister, ending his tenure as head of government and leader of the Labour Party.
The decision follows days of intense pressure from within his own party, including dissent from cabinet ministers, and coincides with the return of Andy Burnham to Westminster.
Reports of the imminent departure had circulated over the weekend, but the formal announcement on Monday marks a sudden and significant shift in the UK's political landscape.
The resignation comes less than two years after Starmer led Labour to a historic election victory, a mandate that is now effectively voided by his departure.
The internal revolt suggests deep fractures within the party, potentially complicating the transition process and raising questions about the stability of the current administration.
For markets, the abrupt change in leadership introduces a period of political uncertainty, which could weigh on investor sentiment and delay key policy decisions.