58% — Next UK Prime Minister in 2026
Leader: Andy Burnham at 58% · Polymarket 58% · 5 contracts · $10K volume · medium confidence
Updated 2026-06-08 01:39:51 UTC

Tracks the leading outcome in a winner-take-all prediction market set with 5 outcomes.

Why this matters:
This 34% probability reflects market expectations that a specific candidate will become the next UK Prime Minister by the end of 2026. The market is pricing in uncertainty around the timing and outcome of potential leadership changes within the governing party or following an election. Major factors pushing the probability upward would include public polling shifts, party dynamics favoring this candidate, or political instability forcing early succession. Downward pressure would come from rising support for alternative candidates or improved standing of the current Prime Minister. The key resolution point will be the next general election, scheduled for January 2025 or whenever Parliament dissolves, which will determine the governing party and available candidates for the top position. Between now and then, internal party contests, scandals, or performance metrics could significantly alter the trajectory of this outcome.

Key factors:
- Current candidate polling position relative to other potential successors in their party
- Timing of the next general election and whether this candidate's party is projected to govern
- Recent shifts in party membership or grassroots support that might influence leadership selection
- Public approval ratings and polling for this specific candidate versus alternatives
- Historical precedent: how often this candidate has been mentioned in credible media coverage as a potential Prime Minister

Contracts:
- Next UK Prime Minister in 2026?: Andy Burnham — 58¢ Polymarket $3K (weight 30%)
- Next UK Prime Minister in 2026?: No Next PM in 2026 — 24¢ Polymarket $1K (weight 10%)
- Next UK Prime Minister in 2026?: Angela Rayner — 6¢ Polymarket $3K (weight 34%)
- Next UK Prime Minister in 2026?: Ed Miliband — 4¢ Polymarket $1K (weight 11%)
- Next UK Prime Minister in 2026?: Wes Streeting — 3¢ Polymarket $1K (weight 14%)

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-06-08T01:20:09.759Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "58% per prediction markets (SimpleFunctions, June 2026)"
Canonical: https://simplefunctions.dev/answer/next-uk-prime-minister
Full data: https://simplefunctions.dev/api/public/query?q=Next%20UK%20Prime%20Minister%20in%202026
Provider: SimpleFunctions — https://simplefunctions.dev