As more than 70 Labour MPs and senior ministers pile pressure on UK Prime Minister Keir Starmer to resign or set a departure timetable following Labour's crushing local election losses, a question is rapidly moving from the hypothetical to the urgent: what actually happens if he goes?
The answer is complicated — and consequential. Here are the options UK is left with, if the PM resigns:
The Rules: A High Bar To Clear
If Starmer resigns as Labour leader, a leadership contest is automatically triggered. Each candidate must be nominated by at least 20% of Labour MPs, currently 81, and must also secure nominations from at least 5% of constituency parties or at least three affiliates, two of which must be trade unions representing a minimum of 5% of affiliated membership.
That is a high bar, and it immediately shapes who can realistically run.
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A Caretaker PM Running The UK
The roles of party leader and Prime Minister are separate, though linked. It is normal for a resigning leader to stay on as Prime Minister until a new leader is elected. In 2007, Tony Blair announced his departure in May but did not leave Downing Street until late June, when Gordon Brown completed the contest and was formally appointed. Britain would, in effect, have a caretaker Prime Minister running the country for weeks — possibly longer.
The Succession Picture
The succession picture is murky. Health Secretary Wes Streeting is the frontrunner among the parliamentary party's right wing.
But the name generating the most public momentum is Greater Manchester Mayor Andy Burnham. Because Burnham is currently not an MP, he would likely need to return to Parliament before realistically becoming Prime Minister.
He would also need a sitting Labour MP to stand down, triggering a by-election in which he could stand and win as Labour's candidate before becoming eligible to enter a leadership race. That process alone could take months, extending the uncertainty further.
The Nuclear Option
Then there is the nuclear option. Cabinet ministers could begin resigning en masse — making it difficult if not impossible to replace them — forcing Starmer's hand without a formal challenge, similar to what happened in 2022 when over 50 members of Boris Johnson's government resigned, ultimately compelling him to step down.
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Labour MP Paulette Hamilton captured the mood bluntly: "The public have made it clear that they do not wish to hear further talk of a 'reset' from Sir Keir Starmer. Confidence is lost. Voters have stopped listening. Now, an orderly transition must follow, and change must come from the top."
The public have made it clear that they do not wish to hear further talk of a “reset” from Sir Keir Starmer.
— Paulette Hamilton MP (@PauletteHamilto) May 11, 2026
Confidence is lost. Voters have stopped listening.
Now, an orderly transition must follow, and change must come from the top.https://t.co/Rs9txA00Zh
If Starmer steps aside or is removed, his successor would become Britain's seventh Prime Minister in a decade — a statistic that, more than any other, illustrates the depth of the political instability gripping one of the world's oldest democracies.
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