Explainer-What happens if the UK's Starmer quits, or is challenged? - Finance news and analysis from Global Banking & Finance Review
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Explainer-What happens if the UK's Starmer quits, or is challenged?

Published by Global Banking & Finance Review

Posted on February 9, 2026

2 min read

· Last updated: June 22, 2026

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Explainer-UK PM Starmer says he will resign, how is his successor chosen?

Understanding the Process of Choosing a New UK Prime Minister

LONDON, June 22 (Reuters) - Prime Minister Keir Starmer said on Monday he would resign, with a new leader to be in place by the time parliament returns in September, paving the way for Britain to have its seventh leader in 10 years.

Here's what happens next:

How Does a Leadership Contest Work?

Eligibility Criteria for Candidates

Any candidate wishing to replace Starmer would need to secure the support of 20% of Labour members of parliament. With Labour currently holding 403 seats, that equates to 81 lawmakers, including the challenger.

Support from Party and Affiliates

Candidates also must hit thresholds for support from grassroots Labour Party organisations, and from affiliated organisations such as trade unions.

Who Gets to Decide the Winner?

The Voting Process

If more than one candidate qualifies, the winner is decided by a ballot of all Labour Party members and affiliates. The winner then becomes prime minister.

How Long Would It Take?

Timeline for the Contest

Though the timeline is officially decided by the party's governing body, Starmer said nominations would open on July 9 and close before parliament goes into recess, which is scheduled for July 16.

He said if there were to be a contest, it should be completed by the time parliament returns, which is scheduled for September 1.

What Happens If There's Only One Candidate?

Unopposed Election

If only one candidate meets the threshold for support, there is no vote: the candidate is elected unopposed as Labour leader and becomes prime minister.

(Reporting by William James and Alistair Smout; Editing by Alex Richardson, Philippa Fletcher and Sarah Young)

Key Takeaways

  • Keir Starmer faces calls to resign over a controversial appointment.
  • A leadership contest would follow Starmer's resignation.
  • Candidates need 20% support from Labour MPs to stand.
  • Labour's process for challenging leadership is complex.
  • Labour has never removed a sitting prime minister.

Frequently Asked Questions

What is the main topic?
The article discusses potential outcomes if Keir Starmer resigns or is challenged as UK Labour leader.
How can Starmer's leadership be challenged?
A challenge requires a candidate to secure support from 20% of Labour MPs and meet other criteria.
What happens if Starmer resigns?
A leadership contest would be held, with candidates needing significant backing from Labour MPs.

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