The UK Gambling Commission is pressing ahead with its Gambling Survey for Great Britain, even as critics keep asking whether it’s systematically inflating both gambling participation and the level of harm in the population.

The UKGC has pushed back hard in response. It doesn’t “recognize” the suggestion that it would knowingly publish inaccurate findings, and insists it’s been transparent every step of the way. The regulator evolved its methodology through pilot and experimental phases before officially designating it as statistics.

The Academic Challenge

The real credibility problem traces back to Professor Patrick Sturgis at the London School of Economics. His 2024 independent review found something awkward: the inaugural GSGB sample had disproportionately more gamblers than you’d find in the wider British population. The issue is simple enough. People who gamble are probably more willing to respond to a survey explicitly about gambling. Researchers call that non-response bias.

Follow-up experiments published in August 2025 backed this up. When survey invitations explicitly mentioned gambling, reported participation jumped by 4 percent. And among those getting gambling-specific invitations, the proportion recording problematic gambling scores was 1.8 percent higher. Sturgis did note this difference didn’t reach statistical significance, mind you.

The Numbers Gap

The practical upshot of this methodological question is hard to ignore. The GSGB reports that 2.7 percent of participants scored eight or higher on the Problem Gambling Severity Index. The NHS-led survey, meanwhile, suggests just 0.7 percent of the population suffers problem gambling. That’s a substantial gap.

The Betting and Gaming Council has jumped on it, regularly citing the NHS figure. The UKGC’s answer: the surveys use different methodologies and shouldn’t be directly compared. Instead, the regulator recommends policymakers look at both sources alongside other evidence to get the full picture.

The Office for Statistics Regulation weighed in last year, suggesting there’s room for improvement. The UKGC acknowledged the survey isn’t perfect but argued it’s essential work. Since then, the regulator has implemented some of Sturgis’ recommendations to tighten things up.

We’ll see how effective those adjustments are when the next results come in.

What the team thinks

SHEENA McALLISTER: Baz raises a fair point about methodology transparency, but the UKGC’s position here is defensible from a compliance standpoint. They’ve engaged with critics through consultation periods and revised their approach multiple times, which is more than many regulators do. The real issue isn’t whether they’re being stubborn, but whether the academic community is properly represented in these feedback loops.

PHILIPPA ASHWORTH: I’d push back slightly on that, Sheena. From a market perspective, methodological credibility is everything. If operators and investors lose confidence in the data the regulator is using to justify policy, we see real business consequences through increased compliance costs and market uncertainty. The UKGC needs to address this head-on, not just insist they’re transparent.

SHEENA McALLISTER: Fair point, Philippa, but there’s a tension here between perfect methodology and pragmatic regulation. No survey is flawless, and waiting for academic consensus could paralyze the Commission. What matters for operators is that the UKGC is consistent and willing to evolve its approach, which they appear to be doing.

PHILIPPA ASHWORTH: Consistency is crucial, agreed. But the market also needs confidence that the data underlying major policy decisions is robust. If operators suspect the survey systematically overstates harm, that erodes trust in the entire regulatory framework. The UKGC would be smarter to commission an independent methodology review rather than dig in defensively.