12AUG

Pollsters split on the Burnham bounce

2 min read

14:07UTC

Deltapoll put Labour up eight points to 28%, level with Reform, days after Burnham took office; YouGov's near-simultaneous poll left Reform clear on 23% to Labour's 20%.

← Back to Reform bleeds councillors, wins by-elections Jump to analysis ↓

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Key takeaway

Deltapoll ties Labour with Reform while YouGov leaves Reform clear, with fieldwork timing explaining the divergence.

Deltapoll put Labour up eight points on 28%, level with Reform UK, in its first survey since Burnham entered Downing Street, with fieldwork running 17 to 20 July 2026 ¹. YouGov, polling 19 to 20 July, recorded far less movement: Reform 23%, the Conservatives 21%, Labour 20% ². Both cannot be right about the size of the shift.

Fieldwork timing explains most of the gap. Deltapoll's sample was gathered fully after Keir Starmer's resignation had been absorbed by voters; YouGov's window opened while it was still settling. One survey shows Burnham erasing a Reform lead in a fortnight, the other a ripple.

Reform's five-week polling plateau had already begun to crack before Burnham arrived , so the direction of travel is shared even where the magnitude is disputed. A second poll confirming Deltapoll's reading would turn a fieldwork artefact into a genuine bounce; until one lands, the scale of Labour's recovery stays an open question.

Deep Analysis

In plain English

Two polling companies asked people who they would vote for in the days after Andy Burnham became prime minister, and got very different answers. Deltapoll found Labour jumped eight points to 28%, level with Reform UK. YouGov found barely any change, with Reform still ahead on 23% and Labour on 20%. This kind of gap between pollsters is normal in the days right after a big political change. It usually takes several more polls, over several weeks, before a clear picture of any genuine shift emerges.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: Theresa May's post-coronation polling in July 2016 also showed a sharp but short-lived Conservative bounce, recorded at different magnitudes by different pollsters before it faded within two months, the same caution Curtice is applying here.

Counter-parallel: Gordon Brown's 2007 'Brown bounce' was larger and more consistent across pollsters than the divergent Deltapoll and YouGov readings of Burnham, and it held for several months before collapsing, showing new-leader bounces do not always fade or diverge quickly.

Consensus view: Sir John Curtice has argued that a single week's post-leadership-change polling should be read cautiously, because honeymoon bounces for new party leaders often halve within a month once the novelty of a leadership change wears off.

Counter-view: The Electoral Reform Society has argued the more important story in the Deltapoll and YouGov gap is not the size of Labour's bounce but the fact that two reputable pollsters can diverge by eight points on the same event, a sign of how volatile a four-party field has become under first-past-the-post.

Key tension: Whether the Deltapoll-YouGov gap reflects genuine uncertainty about Burnham's bounce, or simply normal house-effect variation between the two pollsters that would exist regardless of who leads Labour.

Sources:Deltapoll·YouGov

Mentions:Deltapoll →YouGov →Andy Burnham →Reform UK →Keir Starmer →Gordon Brown →Electoral Reform Society →Downing Street →Labour Party →Welsh Conservatives →Conservative Party →

First Reported In

Update #13 · England's council map redrawn as five sue

Deltapoll· 24 Jul 2026

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Causes and effects

Caused by

Reform plateau breaks after five weeks

Reform's plateau breaking apart in mid-July set up the divergent Deltapoll and YouGov readings of Burnham's bounce.

Occurred 13 Jul 2026

Read story →

This Event

Pollsters split on the Burnham bounce

Deltapoll and YouGov disagree on whether Burnham has erased Reform's lead or barely moved it.

Led to

A second pollster puts Labour ahead of Reform

The unresolved split between pollsters on the Burnham bounce is settled in direction, not size, by More in Common's new lead.

Occurred 27 Jul 2026

Read story →

Different Perspectives

Sinn Féin

Sinn Féin's John O'Dowd ruled out a Stormont walkout on 11 August despite calling the DUP increasingly difficult to work with, closing a question Conor Murphy had left open a fortnight earlier. Only Sinn Féin or the DUP can collapse the joint First Minister office, so the denial gives up the party's own leverage in budget talks.

Scottish Labour

Michael Marra, Joe Fagan and Monica Lennon declared for the Scottish Labour leadership, but each needs nine endorsements from MSPs, MPs and unions before members vote, with nominations closing 17 August. Lennon, the only woman standing, says the threshold favours a male-run process and could produce an all-male ballot.

Plaid Cymru

Plaid Cymru held both Welsh wards Reform challenged in the same set of by-elections, Bro'r Llynnoedd on Anglesey by 48.5% to 39.3% and Hengoed on Caerphilly by 49.9% to 36.4%. The party that leads the Welsh government kept Reform in second in both.

Conservative Party

The Conservatives lost three of ten council by-elections fought on 30 July and 6 August, two wards to Reform in Norfolk and one to the Greens in Surrey, continuing a run of losses since the May sweep. Every seat gone had been Conservative-held going into the contest.

Reform UK

Reform's 56 lost councillors since May came from defection, suspension and resignation, not lost votes, while the party gained three of ten council by-elections and finished second in four more over the same fortnight. That record undercuts reading the churn as electoral retreat.

Democratic Unionist Party

Gavin Robinson rejects Sinn Féin's characterisation of the institutions as precarious, says the DUP is "committed to" delivering for the public, and will not be "goaded" into a dispute he attributes to Treasury funding rather than unionist bad faith.