Wes Streeting resigned as Health Secretary on Thursday, publishing a letter in which he said he had lost confidence in Keir Starmer's leadership. Streeting's letter called for a comprehensive leadership contest with the broadest possible range of contenders, arguing that Starmer should not be the one to lead Labour into the next general election. "Where we need vision, we have a vacuum. Where we need direction, we have drift," he wrote.

The resignation follows a difficult week for the Prime Minister. Labour lost over a thousand English council seats in local elections on 7 May, ended its 27-year dominance in Wales, and came a distant joint second with Reform in Scotland. In the days that followed, calls for Starmer to resign or set a departure timetable grew steadily louder among backbenchers.

Before he quit, Streeting had been telling supporters privately that he had secured backing from 81 MPs, the number required to formally trigger a leadership contest. Allies said he had nonetheless hoped Starmer would stand down without being directly challenged. Darren Jones, chief secretary to the Prime Minister, spent several hours speaking to MPs who had indicated support for Streeting, and persuaded a number to withdraw their names.

Angela Rayner, widely seen as a potential candidate, resolved a tax dispute with HMRC on Thursday, settling £40,000 in unpaid stamp duty. The settlement removes an obstacle that had complicated her position. She has indicated she would enter a contest if one is formally triggered, though she declined to comment further in an interview with ITV, saying she would not get into hypotheticals about the leadership.

Chancellor Rachel Reeves said a contest would "plunge the country into chaos." Cabinet ministers pushed back against reports that they were preparing to ask Starmer to stand down, with some accusing Streeting's allies of trying to brief resignations into existence.

Some Labour MPs have drawn comparisons with the end of Theresa May's premiership, where personal sympathy for a leader coexisted with private acceptance that the position had become untenable. More than 110 Labour MPs signed a statement arguing this was no time for a leadership contest, though not all are understood to be firm Starmer supporters. One MP who signed said: "I've not signed up to have him forever. But I don't want to be remembered for triggering the first Labour prime minister for 14 years."

The loss of a cabinet minister of Streeting's profile adds a new dimension to the crisis. As Health Secretary, he had been one of the more prominent faces of the government's NHS reform agenda, publicly committed to reducing waiting lists and shifting the health service towards a more preventative model. His departure leaves that agenda without its most visible advocate at a point when the NHS remains under considerable pressure.

The question of who succeeds him, and under what circumstances, carries real consequences for the health system. A prolonged leadership contest would almost certainly delay legislative and policy progress in health, at a time when NHS England is midway through a significant structural reorganisation. Any incoming Health Secretary, regardless of political background, would face an immediate decision about whether to continue or revisit commitments already made to NHS staff, integrated care boards, and independent providers.

Streeting had also been in active negotiations with medical unions and was pursuing a productivity agenda tied to the government's broader fiscal constraints. Those conversations would be effectively paused during any transition period.

Whether Starmer can survive the coming days remains unclear. The Prime Minister said on Wednesday that a leadership challenge had not been triggered and that he intended to get on with governing. With Streeting now outside the cabinet, the pressure on remaining ministers to hold the line is likely to intensify.