Will Conservative Party finish 3rd in the 2026 Holborn and St Pancras by-election

30-day trend

Analysis

This 20% probability indicates that markets assess a one-in-five chance the Conservative Party finishes third in the upcoming Holborn and St Pancras by-election, behind the top two finishers. The Conservative position in this traditionally Labour-held urban seat reflects both their current national polling weakness and local historical performance. The main drivers of this probability are Labour's structural dominance in the constituency and the distribution of votes among multiple challengers. Reform UK markets at 43% for third place, suggesting fragmentation among centre-right and right-wing candidates could be decisive. The by-election date and actual candidacy announcements remain critical uncertainties—the timing and profile of Conservative candidate selection, combined with local campaign dynamics and tactical voting patterns, will significantly influence whether the party can secure a top-three finish or slip further down the ballot. Real-time polling releases and campaign momentum in the final weeks would provide the clearest signals for probability adjustment.

• ›Holborn and St Pancras is a heavily Labour-favoured urban constituency where the second and third-place finishes are typically highly competitive between non-Labour parties
• ›Reform UK's higher third-place probability (43%) suggests market expectations that right-wing vote splitting could push Conservatives out of the top three
• ›Local candidate quality, profile, and campaign resources will materially affect Conservative visibility and vote efficiency in a crowded field
• ›Tactical voting behaviour among anti-Labour voters will determine whether Conservative votes concentrate on one challenger or disperse across multiple parties
• ›The final 1-2 weeks before polling will likely see significant probability shifts as campaign momentum and local events become clear

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These markets stopped trading. Last odds and any captured outcome are shown above — full settlement detail lives at the venue.

How we compute these odds