Who will be the next Prime Minister of the UK?

Precise polling data for this specific voter migration path is unavailable. Publicly available research does not explicitly provide exact polling data on the percentage of voters who switched from the Conservative Party in 2019 to the Labour Party in 2024, and then subsequently indicated an intention to vote for Reform UK. This particular three-step voter migration has not been broken down in the provided data.

YouGov data illuminates a similar Conservative-Labour-Reform migration pattern. Related analysis by YouGov in June 2024 offers insight into a comparable voter segment. This research indicates that among current Reform UK voters who had previously supported Labour in the 2024 election, approximately 31% had voted Conservative in the 2019 general election ^[1]. This highlights a group within the electorate that initially moved from the Conservatives to Labour before ultimately shifting their support to Reform UK.

These switchers from Labour to Reform exhibit specific demographic characteristics. According to the same YouGov analysis, these particular Labour-to-Reform switchers are identified as disproportionately working-class, Leave-voting, and non-graduates ^[1]. These findings suggest distinct demographic and political leanings within this segment of voters.

Union leader Sharon Graham has publicly criticized Keir Starmer's leadership. Sharon Graham, General Secretary of Unite the Union, publicly lambasted Labour's leadership as 'austerity lite' and 'rudderless' ^[3]. Graham further predicted a Labour defeat in the May 2026 elections, anticipating an 'inevitable replacement debate' and a subsequent leadership challenge ^[3].

Unite the Union has taken tangible steps to reduce support. In a move signaling diminished support, Unite drastically reduced its affiliation fees to the Labour Party by 40%, an amount totaling £580,000, in March 2026 ^[1]. This significant cut followed a dispute concerning Birmingham bin strikes ^[1]. Furthermore, Unite has scheduled a conference for its members in 2027 to discuss complete disaffiliation from the Labour Party, indicating a potential severance of ties ^[2].

Limited information confirms Christina McAnea's personal stance. While the research notes Andrea Egan's replacement of Christina McAnea as UNISON General Secretary and Egan's critical view of Starmer, specific details concerning McAnea's replacement or Egan's subsequent actions are not explicitly confirmed by the cited sources. Nevertheless, the public statements and actions by prominent union leaders, particularly Sharon Graham, strongly indicate a substantial weakening of institutional backing for Keir Starmer's leadership.

Specific private polling on 'voter ceilings' for specific platforms remains elusive. Research did not identify specific private polling or focus group data circulated within Conservative Party factions, such as C|T Group or the European Research Group, that projects a 'voter ceiling' for Kemi Badenoch-style versus James Cleverly-style centrist platforms. However, public information indicates that the Conservative Party is contending with significant public opinion challenges. Kemi Badenoch has publicly acknowledged concerns about current polling, noting a vote share around 17% and attributing this in part to Reform UK capturing centre-right voters ^[1].

Broader Conservative strategies highlight significant electoral challenges ahead. While direct comparisons of 'voter ceilings' for these specific platforms are not publicly available from private party data, the Conservative Party's broader strategy aims to secure approximately 60 seats by appealing to between 4.8 and 7.5 million voters ^[2]. Prediction markets for the 'Next UK Prime Minister in 2026' reflect a challenging outlook for Conservatives, with candidates like Kemi Badenoch and James Cleverly each having less than 1% odds ^[3]. This situation aligns with the broader Conservative dilemma of whether to 'unite the right' or 'hold the centre' ^[4].

UK 5-year sovereign credit default swap (CDS) spreads do not suggest unique political instability. Currently, UK 5-year CDS spreads stand at approximately 22 basis points (bp) ^[1]. While these spreads are higher than those of German equivalents, which typically range from 8-12 bp ^[2], they remain considerably lower than US 5-year CDS spreads, recorded at around 38 bp ^[4]. Overall, UK CDS spreads are considered to be within normal ranges, indicating no clear pricing of unique UK political instability when compared across these major economies.

Specific data for 10-year Gilt yield implied volatility is not readily available. However, an examination of 10-year Gilt yields reveals they are currently around 4.9% ^[3]. This yield is higher than German 10-year Bund yields, which are approximately 2.9-3.1% ^[5], and also surpasses US 10-year Treasury yields, which track around 4.4%. This elevated yield environment for UK Gilts is reportedly influenced by broader global factors, such as Middle East tensions, contributing to higher yields across various international markets rather than unique UK issues.

Markets do not reflect unique pricing of UK political instability. Despite ongoing UK political instability, market reactions do not indicate a unique pricing of this instability. ING reports that Gilts have actually seen a rally, with any perceived risk premium having reportedly evaporated ^[6]. Furthermore, Goldman Sachs suggests that Gilts are expected to look past political developments into 2026 ^[7]. Therefore, current market pricing, based on available data, does not show a sustained, significant divergence driven by unique UK political instability.

No specific number of rebellious Labour MPs from the 2024 intake is available. Currently, there is no estimated figure for Labour Members of Parliament from the 2024 intake who have privately communicated to party whips or publicly signaled their intention to vote against the government on critical 'confidence-and-supply' issues, such as the next Autumn Statement or Budget. Web research indicates no such figure is available concerning confidence votes or signals.

New Labour MPs have shown defiance in other parliamentary votes and issues. Despite the lack of data on confidence-and-supply intentions, Members of Parliament from the 2024 Labour intake have engaged in other forms of defiance. In 2024, 53 Labour MPs, which included some new Members, abstained on a vote concerning the winter fuel allowance ^[1]. Furthermore, in 2025, over 120 Labour MPs, with approximately half of them being from the new intake, threatened to block a welfare bill ^[2]. Additionally, three new MPs from the 2024 intake were among four Members who faced suspension in 2025 for repeated rebellions, notably including stances on welfare issues ^[3].

As of March 2026, Keir Starmer remains the Prime Minister, with the next general election mandated by August 2029 ^[1]. Prediction markets suggest a 37% probability of no leadership change by the end of 2026 ^[2]. If a change were to occur, Angela Rayner is currently favored, with prediction markets giving her a 23% chance and bookmakers listing her at 11/4 to be the next Prime Minister after Starmer ^[3]. Several factors could catalyze a leadership shift ^[4]. Significant events to watch include the local and devolved elections on May 7, 2026, which could serve as a potential trigger for a Labour leadership challenge ^[5]. Other catalysts for a change include sustained low approval ratings for Starmer, the emergence of scandals such as the Mandelson-Epstein allegations, consistently poor polling results for Labour, and losses in by-elections to parties like the Greens or Reform UK ^[6]. Internal tensions within the Labour party and the increasing prominence of Reform UK also act as bullish indicators for a leadership change ^[7]. Conversely, the absence of an immediate trigger for a snap general election currently acts as a bearish factor against an early leadership change ^[8]. While there are no specific markets for 2030, the broader outlook for the next general election, whenever it occurs, suggests a competitive landscape, with odds favoring either a hung parliament or a close contest between Labour and Reform UK ^[9].