This week’s YouGov poll, the first since Nigel Farage and his party challenged the firm’s approach, shows reform uk polling at 25% in headline figures — a rise of two points from the previous week. The sample of 2, 329 respondents was interviewed on Sunday 15 March and Monday 16 March; YouGov has agreed to publish more underlying data about each poll while saying its methodology remains unchanged.
Why this matters right now
The poll comes at a moment of heightened scrutiny over how voting intention is measured. The YouGov numbers used here show Reform UK at 25% (+2), the Greens on 19% (no change), Conservatives on 17% (-2), Labour on 17% (no change) and Liberal Democrats on 14% (no change). Because this is the first public poll after a direct challenge by Nigel Farage and his party, the decision by the pollster to supply additional underlying data is being interpreted as a shift toward greater transparency even as the stated methodology is retained.
Deep analysis: What lies beneath the Reform Uk lead
At the centre of the dispute are two elements of the pollster’s approach that are present in the data: a pair of voting intention questions and a multi-level regression and post-stratification (MRP) model used to convert raw answers into headline voting intention. The first question asks how respondents would vote if an election were held tomorrow; the second asks how they would vote if thinking specifically about their own constituency. The two answers are combined and run through the MRP model to generate the published figures.
The context notes that different pollsters treat support for reform uk differently, partly because many respondents describe themselves as irregular voters who say they would back Nigel Farage’s party in a generic ‘election tomorrow’ question. Firms diverge on how likely those stated intentions would be to translate into actual votes in constituencies. This week YouGov’s headline figure for Reform UK is 25% — an increase from 23% in an earlier YouGov poll taken on 9–10 March — while other parties show smaller movements or none at all.
The company has maintained the mechanics of its model but will now publish both the constituency-prompted and the unprompted voting intention results. That change addresses the specific complaint that the constituency prompt — the second voting question — alters the balance of support between parties when filtered through the MRP model.
Expert perspectives and wider consequences
One commentator cited in the context is Peter Kellner, described as a pollster and a one-time employee of YouGov, who said that “the use of a second voting intention question about how a respondent would vote if thinking about their constituency would advantage the Liberal Democrats over Reform UK. ” That assessment has been central to the challenge lodged by the party and its leader in the wake of recent figures.
The party leadership has framed the publication of additional data as a victory for transparency, while YouGov has made clear it “stands by its approach” and will continue to apply the two-question plus MRP methodology. The immediate consequence is a more granular public dataset for analysts and campaigns to interrogate, but the methodological debate is likely to continue: how best to treat irregular self-identified supporters, how constituency-level prompts reshape answers, and how MRP adjustments affect small but politically significant parties.
Beyond the headline, the available figures and the procedural concession have ripple effects for how parties plan messaging and resource allocation. Parties tracking the YouGov series now have both the modelled headline and the unprompted constituency-free responses to weigh when deciding whether local campaigning should focus on converting expressed national support into reliable constituency-level turnout.
For pollsters and political strategists, the episode underscores the tension between methodological innovation designed to capture tactical voting and the demand from parties for transparency about the raw inputs that feed complex models.
As the polling sequence continues, the central question is whether the additional published data will narrow discrepancies between pollsters’ treatment of reform uk and produce greater convergence in projected vote shares — or simply provide fresh fields for debate about modelling choices, turnout assumptions and the behaviour of irregular voters. How that plays out will shape both polling practice and party strategy in the coming weeks.
Where will the next shifts in voting intention appear, and will greater data transparency change how analysts and campaigns interpret the support for reform uk?
