William Hill Slot RTPs in 2026: The Most Aggressive Reductions in the UK

An Old Name, a New Pattern

William Hill is one of the oldest names in UK gambling. Under Evoke's ownership — the parent company also behind 888casino — it has become the most aggressive documented case of RTP reduction among major UK operators.

RTPTrack's verified data for William Hill is limited in breadth but striking in severity. The confirmed deployments rank among the lowest at any UKGC-licensed casino.

Big Bass Bonanza at 92.00% — Below the Floor

Big Bass Bonanza runs at 92.00% at William Hill. This is below even Pragmatic Play's lowest standard tier of 94.02%. Forum evidence from the backinamo.com community documents that William Hill cut Big Bass from 94.02% to 92.00% in November 2023 — a reduction that was noticed and reported by players but received no mainstream media coverage.

Mystery Reels Megaways at 91.07%

Mystery Reels Megaways runs at 91.07%. Red Tiger certifies this title with tiers ranging from 98.06% to 92.12%. William Hill is deploying below even the lowest standard tier, suggesting either a bespoke configuration or a jackpot contribution that further reduces the base RTP.

John Hunter and the Book of Tut at 92.07%

John Hunter and the Book of Tut runs at 92.07%. The provider's theoretical maximum is 96.50%. The gap of 4.43 percentage points is one of the largest verified reductions on a single title at any UK casino.

The November 2023 Watershed

The November 2023 event was a watershed. Multiple players reported simultaneous RTP cuts across William Hill's catalogue, documented on the backinamo.com forum. The cuts were not announced by William Hill and received no coverage from gambling industry media. They were detected by players who routinely check in-game info panels — exactly the kind of verification RTPTrack exists to provide at scale.

Evoke's Financial Pressure

Context matters. Evoke — William Hill's parent — is under severe financial pressure from the 40% Remote Gaming Duty increase. The company expects £125 to £135 million in annualised costs, withdrew its FY26 guidance, announced approximately 200 shop closures and 1,500 job losses, and entered takeover talks with Bally's Intralot at 50p per share in April 2026. The RTP reductions predate the RGD increase but the financial incentive to maintain or deepen them has intensified.

The Verdict for Players

For players considering William Hill, the verified data suggests it is among the lowest-value options for slot RTP among major UK casinos. The confirmed deployments sit 2-5 percentage points below theoretical maximums. Until broader verification is available, RTPTrack recommends treating all William Hill slot RTPs as potentially reduced and checking the in-game panel before every session.

How William Hill Compares

For comparison: the same Big Bass Bonanza runs at 95.67% at Sky Vegas, 94.02% at Paddy Power and Betfair, and 94.02% at MrQ. At £1 per spin over 1,000 spins, William Hill's 92.00% deployment costs £80 in expected losses versus £43.30 at Sky Vegas — nearly double.