Who will be the next Prime Minister of the UK?

There is no publicly tracked tally of Labour MPs' leadership support. Current sources do not explicitly provide a precise, ongoing tally of Labour MPs' support for potential leadership challengers like Angela Rayner or Wes Streeting, as monitored by parliamentary whips or political blogs such as Guido Fawkes [Web Research Results]. While political discussions and internal maneuvering are reported, neither whips nor Guido Fawkes offer an explicit, tracked number of MPs engaged in such activities. For instance, Guido Fawkes has reported on internal party dynamics, including alleged plots concerning Wes Streeting, but its tracking does not extend to specific leadership pledges from MPs [7, Web Research Results].

Various reports, despite no formal tally, indicate claimed MP support. Despite the absence of a formal tally, various reports indicate levels of claimed support for both individuals. In January 2026, allies of Angela Rayner claimed that 80 Labour MPs were prepared to back her in a leadership contest ^{[^]}. Concurrently, Wes Streeting's support was initially reported as less than 80 MPs, subsequently rising after briefings, with some claims indicating up to 200 MPs were solidly for Streeting in January 2026 [Web Research Results, 10]. Reported activities such as MPs lending staff to work on Streeting's leadership campaign or attending fundraisers also illustrate underlying support [4, Web Research Results].

Kemi Badenoch leads Keir Starmer among 2019 Conservative voters. YouGov polling from January 2026 indicates Kemi Badenoch holds a significant lead over Keir Starmer among the 2019 Conservative voter demographic. Among these voters, 68% expressed a preference for Badenoch as Prime Minister compared to 17% for Starmer ^{[^]}, ^{[^]}. This finding highlights Badenoch's strong standing within a crucial electoral group for a potential leadership bid.

Direct polling comparison for James Cleverly against Starmer is unavailable. No recent head-to-head polling from YouGov or Redfield & Wilton directly comparing James Cleverly against Keir Starmer specifically among 2019 Conservative voters was identified [Web Research Results]. James Cleverly has not been featured in recent "best Prime Minister" polls by YouGov in a manner that allows for direct comparisons in this context, and available favourability ratings do not provide this specific insight ^{[^]}, ^{[^]}, ^{[^]}.

Prediction markets show low probabilities for both becoming the next PM. Despite Badenoch's strong showing in specific polls, both Kemi Badenoch and James Cleverly currently have low probabilities, less than 1%, of becoming the next UK Prime Minister before 2030, according to prediction markets such as Kalshi and Polymarket ^{[^]}, ^{[^]}. These markets generally favor other outcomes for the next Prime Minister.

Official net gains for May 2026 Labour council seats are unavailable. As of March 24, 2026, the UK local elections scheduled for May 2026 have not yet taken place, meaning there are no official figures regarding Labour's net gain or loss of council seats. Despite the absence of official results, pre-election projections and trends from recent by-elections indicate that Labour is anticipated to incur significant losses. These losses are particularly projected in 'Red Wall' areas to Reform UK, within London to the Greens and other parties, and in southern districts to the Liberal Democrats ^{[^]}.

Labour faces significant challenges defending seats from previous cycles. The party is defending approximately 2,200 seats out of about 4,850 contested in 2026, many of which were secured during earlier electoral cycles when Labour's support was comparatively stronger ^{[^]}. This electoral context suggests the party has "little to win, but a lot to lose" ^{[^]}. Further underscoring these difficulties, Labour has experienced an overall net loss of 52 seats in by-elections since May 2025.

Poor local election results could trigger a Labour leadership challenge. A weak performance by Labour in the upcoming May 2026 local elections is widely regarded as the most probable catalyst for a formal leadership challenge to Keir Starmer. This potential challenge is exacerbated by recent notable by-election losses, such as Gorton & Denton to the Greens in February 2026, which prompted demands from Labour Members of Parliament for a change in the party's strategic direction ^{[^]}.

Reform UK has experienced a significant increase in large-scale private donations. This upward trend is particularly evident following the 2024 election, culminating in Reform UK receiving approximately £18.5 million in private donations for the full calendar year 2025. This figure notably surpassed the Conservative Party's £13.4 million for the same period ^{[^]}. The shift, which saw Reform UK overtake the Conservatives in private donations beginning in Q1 2025 and maintaining its lead in subsequent quarters, suggests a structural realignment within the UK's right-wing political landscape ^{[^]}.

Quarterly data confirms Reform UK's escalating funding from large-scale donations. The party's declared large-scale donations show a clear rise, increasing from £281,000 in Q4 2024 ^{[^]} to £1.48 million in Q1 2025 ^{[^]}. A substantial surge further occurred in Q3 2025, where Reform UK secured approximately £10.3 million. This significant increase was notably boosted by a £9 million donation from Christopher Harborne ^{[^]}.

Former Conservative donors reallocate support to Reform UK, enhancing its viability. This reallocation of funding is further underscored by numerous donors previously supporting the Conservative Party, including Bassim Haidar, Nick Candy, JCB, and Mohamed Amersi, who have switched their financial backing to Reform UK. This shift enhances Reform UK's viability and potential influence on the political landscape ^{[^]}.

A Labour leadership challenge requires 81 Parliamentary Labour Party nominations. To trigger a Labour Party leadership contest, a challenger must secure nominations from 20% of the Parliamentary Labour Party (PLP) ^{[^]}. This threshold was established through rule changes implemented in 2021 and aligns with the party's 2025 rulebook and procedures for recent deputy leadership elections ^{[^]}. As of early 2026, the Labour Party comprises 404 Members of Parliament (MPs) ^{[^]}. Applying the 20% threshold to this number, approximately 81 nominations are required (20% of 404 MPs equals 80.8, which is rounded up) [Web Research Results].

Factional data lacks detail for assessing a coalition's viability. While resources exist that map Labour MPs and their perceived affiliations, such as "Labour Tribes Mapped" ^{[^]}, the provided research does not include specific data or a breakdown of MPs categorized by 'soft left' and 'right' wings. Consequently, based solely on the available information, it is not possible to demonstrate a viable mathematical coalition between these particular factional groups to reach the necessary 81 nominations for a leadership challenge.

The most significant catalyst for a change in the UK Prime Minister before the next general election is the potential exit of current PM Keir Starmer [^] . Prediction markets indicate a 65-70% chance of Starmer leaving office by the end of 2026 ^{[^]}. This probability is largely driven by potential factors such as public backlash over future budgets, significant losses in upcoming by-elections to parties like the Greens or Reform UK, and any potential fallout from political scandals ^{[^]}. Beyond Starmer's immediate position, other electoral events and party dynamics could influence the political landscape ^{[^]}. The devolved and local elections scheduled for May 7, 2026, including contests for the Senedd, Scottish Parliament, and English local councils, will be key indicators of public sentiment and could either solidify or weaken the incumbent government's standing ^{[^]}. While an early general election call is currently seen as unlikely, sustained poor polling performance for Labour against parties like Reform UK, or internal party rebellions, could create pressure for leadership changes ^{[^]}. Conversely, if Labour were to secure an exceptionally large majority in the eventual general election, exceeding 400 seats, it would act as a strong deterrent to any immediate leadership challenges ^{[^]}.