UK Black Market Hits £16.6bn as Legal Betting Share Falls to 92%

Illegal gambling operators attracted £16.6bn in UK stakes in 2025, more than tripling from approximately £5bn in 2019, as rising taxes and tighter regulation on licensed operators pushed customers toward unregulated sites, according to H2 Gambling Capital analysis commissioned by the Betting and Gaming Council. The regulated market’s share of total UK gambling activity fell from 97% in 2019 to 92% in 2025.

The acceleration is the detail that stands out. Both stakes and operator profits in the black market doubled between 2023 and 2025, suggesting the pace of migration is speeding up. A separate Frontier Economics study found more than one in five 18-to-24-year-olds who bet are already using unlicensed operators, including via secure messaging apps.

Illegal operators have also overtaken licensed brands in ad spend. WARC analysis cited by the BGC shows unlicensed sites now account for nearly half of all UK gambling advertising spend, and that share is set to become the majority within two years.

Grainne Hurst, Chief Executive of the Betting and Gaming Council, said illegal operators are “becoming more sophisticated, more visible and more aggressive” in reaching UK consumers, and warned that customers who find regulated sites harder to use “will not stop betting, they will simply go elsewhere.” On proposed financial risk assessments, Hurst stated that “financial risk assessments must either be genuinely ‘frictionless’ or not introduced at all.”

The regulated sector currently supports more than 109,000 jobs, contributes £6.8bn to the UK economy, and generates £4bn in tax annually.

TGJ Take

The five-point drop in legal market share over six years is the number policymakers should focus on, and the rate of decline is accelerating. The BGC is building a data-backed case that regulatory friction and consumer protection are in direct tension. Financial risk assessments are the named target. For operators already absorbing higher taxes and compliance costs, this research gives them something concrete to put in front of ministers: each additional layer of friction now has a quantifiable customer leakage cost attached.