10% — Will Rosena Allin-Khan win the 2028 London mayoral election
Kalshi 10% · 6 contracts · $0 volume · medium confidence
Updated 2026-08-24 23:05:35 UTC

Why this matters:
This market estimates a 12% chance that Rosena Allin-Khan, the current Labour MP for Tooting, will win the mayoralty of London in the 2028 election. The probability reflects her status as a prominent Labour politician in a city with strong Labour support, but tempered by the crowded field of potential candidates and the uncertainty inherent in multi-candidate races held more than two years away. The main factors shaping this estimate are her current political profile and whether Labour retains momentum heading into 2028, alongside competition from other Labour figures and the Conservative challenger. The December 2028 mayoral election itself will be the primary catalyst that resolves this uncertainty, though earlier developments like formal candidate announcements or significant shifts in London-wide polling could meaningfully shift expectations.

Key factors:
- Allin-Khan would need to secure Labour's official nomination in a potentially contested internal process with other prominent party members also interested in the role
- Labour's electoral standing in London and nationally between now and 2028 will influence baseline expectations for any Labour candidate's viability
- Her profile as an MP and former shadow minister makes her a credible contender but not a prohibitive favorite, suggesting other candidates are viewed as realistic alternatives
- The incumbent mayor's political affiliation and performance track record typically influences voter behavior and candidate recruitment in mayoral races
- Historical London mayoral elections show variation in outcomes despite demographic favorability, indicating that frontrunner status is not determinative

Contracts:
- Will James Cleverly win the 2028 London mayoral election?: James Cleverly — 4¢ Kalshi $0 (weight 17%)
- Will Laila Cunningham win the 2028 London mayoral election?: Laila Cunningham — 17¢ Kalshi $0 (weight 17%)
- Will Mete Coban win the 2028 London mayoral election?: Mete Coban — 3¢ Kalshi $0 (weight 17%)
- Will Rosena Allin-Khan win the 2028 London mayoral election?: Rosena Allin-Khan — 3¢ Kalshi $0 (weight 17%)
- Will Sadiq Khan win the 2028 London mayoral election?: Sadiq Khan — 26¢ Kalshi $0 (weight 17%)
- Will Zack Polanski win the 2028 London mayoral election?: Zack Polanski — 4¢ Kalshi $0 (weight 17%)

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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: 2026-08-24T22:20:50.878Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "10% per prediction markets (SimpleFunctions, August 2026)"
Canonical: https://simplefunctions.dev/answer/londonmayor
Full data: https://simplefunctions.dev/api/public/query?q=Will%20Rosena%20Allin-Khan%20win%20the%202028%20London%20mayoral%20election
Provider: SimpleFunctions — https://simplefunctions.dev