No one can say with certainty who will win the Gorton and Denton by‑election, but we can sketch the most likely outcomes and why each is plausible.

Quick Scoop: What’s Going On?

The Gorton and Denton by‑election (polling day: 26 February 2026) is shaping up as a genuine three‑way marginal between Labour, Reform UK and the Green Party. Labour held the seat comfortably in 2024, but its vote has softened nationally and in similar by‑elections, opening space for both Reform and the Greens.

Key points:

  • It’s widely described by analysts as a three‑horse race.
  • Turnout is expected to be low, which makes small shifts in motivation and tactical voting crucial.
  • Different data sources point in different directions, which is why there is no consensus “winner” yet.

What the Polls and Odds Say

Different indicators currently point to different favourites, which is why this is seen as a “pollster’s nightmare.”

Published modelling and analysis

  • One academic-style analysis (using by‑election history and modelling) concludes that, despite hype around Reform and the Greens, Labour is still slightly more likely to win because the anti‑Labour vote is split between those two challengers.
  • The same work notes that if Reform repeats the kind of swing seen in Runcorn and Helsby – a previous by‑election where Reform surged and Labour fell sharply – Reform “may have a viable chance at victory,” but that this is not the most probable outcome.

Betting markets

  • Political betting markets have recently had Reform UK and the Greens as joint favourites , with Labour a close third.
  • At one point, prices were roughly:
    • Reform UK: about 13/8
    • Green Party: about 13/8
    • Labour: around 9/4
      with all other parties long shots.
  • Betting share over a recent 24‑hour period showed more money going on Reform and the Greens than on Labour, suggesting punters see the race as between the two challengers, not Labour.

Final‑week polling and canvass data

  • A late poll cited on Instagram (Opinium, via Novara Media) had Greens 30%, Labour 28%, Reform 27% among “likely voters” , i.e. a razor‑thin Green lead well within any sensible margin of error.
  • Internal and canvassing figures reported elsewhere have shown:
    • Reform UK’s internal numbers putting themselves in first, Greens second.
* Green canvass data from roughly 18,000 conversations suggesting them 0.2 points behind Reform, with Labour third.
  • Commentators like Lord Hayward have publicly said they can “foresee the Greens winning,” while other analysts emphasise that any of the three could plausibly top the poll.

Who Looks Most Likely Right Now?

Putting the different indicators together, you essentially get three competing narratives:

  1. Labour slightly favoured (history & structure argument)
    • Labour won here in 2024 with around half the vote and still has strong organisational depth and brand recognition.
 * With the anti‑Labour vote split between Reform and the Greens, a modest Labour core vote could still be enough to hold on.

 * This is the logic of the academic modelling that ends up with Labour as “most likely winner,” even if not by much.
  1. Greens edged ahead (late polls & tactical‑vote argument)
    • The final public poll showing Greens 30, Labour 28, Reform 27 among likely voters suggests a very slight Green edge if those turnout patterns are right.
 * Tactical‑voting messaging from Green sources and sympathetic media has framed this increasingly as a “two‑horse race” between Greens and Reform, encouraging Labour‑leaning left voters to back the Greens to stop Reform.

 * If that left‑bloc consolidation works even marginally, the Greens could squeak a win by a few points.
  1. Reform breakthrough (Runcorn‑style swing argument)
    • Reform has shown it can surge in similar kinds of seats, notably Runcorn and Helsby, where Labour’s vote share dropped sharply and Reform gained strongly.
 * If older, more discontented Tameside‑side voters turn out more heavily than younger Manchester‑side voters, that pattern would favour Reform.

 * Betting flows have recently tilted slightly toward Reform, which some see as a hint that they might be better‑organised and energised than their rivals.

The Seat’s Unique Profile

The constituency itself is unusually split, which is part of why predictions are so uncertain.

  • Manchester wards (about 65% of voters) skew younger, more diverse and historically more left‑leaning, fertile ground for Labour and the Greens.
  • Tameside wards (about 35%) skew older and whiter, a profile more open to Reform’s pitch and more sceptical of Labour.
  • Turnout was only about 48% at the 2024 general election and could be even lower in the by‑election, so which half of the seat turns out in greater numbers may matter more than any polling headline.

One analyst dubbed it “a tale of two Manchesters” – an unpopular national government, a fragmented opposition, and a seat where local demographics sharply diverge. That combination is exactly what makes the outcome so hard to pin down.

So… who will win?

If you force a call, here is the most defensible way to phrase it based on current public information:

  • Most plausible winner on modelling fundamentals: Labour, thanks to vote‑splitting between the Greens and Reform and their historic base.
  • Most plausible “upset” winner on late polling and tactical‑vote dynamics: The Green Party, if left‑leaning voters coalesce behind them at the last minute.
  • Most plausible “shock” result: A narrow Reform UK win, if older and more disillusioned voters turn out strongly and repeat the pattern seen in Runcorn and Helsby.

Given how tight the polling and betting indicators are, any of the three main parties could realistically take it, and a victory margin of just a few hundred votes would not be surprising.

Information gathered from public forums or data available on the internet and portrayed here.