A trial run across three UK-licensed operators found that removing the £5 minimum stake on selected slot titles after 10pm produced a 21% lift in total spins during the 10pm–2am window, with no corresponding rise in net deposits per active player. The change applied to 14 titles with stake floors between 10p and 50p, and the lift held after adjusting for day-of-week and promotional calendar effects. It is a small operational tweak with a disproportionately large effect on late-night engagement — and a set of responsible gambling questions attached.

What the trial actually changed

The mechanics matter more than the headline. Between 4 March and 28 April 2024, three operators running the same proprietary slot portfolio removed the £5 floor on 14 titles for a cohort of roughly 62,000 accounts, split evenly between a test group and a holdout. The floor was replaced with each game's native minimum, which ranged from 10p to 50p. Everything else stayed fixed: RTP settings, max bet caps, autoplay limits, and the existing £2.50 per-spin ceiling on the affected titles.

The 21% figure is the change in total spins per active player in the 10pm–2am window, test versus holdout, averaged across the four-week period. Two details are worth pulling out. First, the lift was concentrated almost entirely in the 10pm–midnight segment, where it ran at 27%; after midnight it flattened to 6%, within noise. Second, average stake per spin fell from £1.84 to £1.31, so gross gaming yield rose by roughly 8% — a real but far smaller number than the spin count suggests.

That gap between spins and yield is the interesting part. Removing a floor doesn't make people spend more; it makes them spend in smaller units, more often. Anyone reading the 21% as a revenue story is misreading it.

Why 10pm specifically

The operators didn't choose the hour arbitrarily. Late evening is when the £5 floor does the most damage to engagement among casual players — the group most likely to be playing a short session on a phone rather than settling in at a desktop. Below £5, a player who wants twenty minutes of low-stakes play has to either overstake or leave. The data suggests a meaningful share of them left.

There's also a scheduling effect. The 10pm–midnight window overlaps with the post-watershed period when a chunk of the audience is winding down, and a £5 spin is a different proposition at 10:30pm on a Tuesday than at 9pm on a Saturday. Operators have long known their stake distribution shifts lower as the night goes on; a flat £5 floor fights that curve.

The responsible gambling problem buried in the number

A 21% rise in spins is not neutral. More spins per player per session is, all else equal, more exposure — and the sessions in question are late-night ones, which are already overrepresented in harm indicators. The trial operators knew this, which is why the design included a set of countermeasures that rarely make it into the summary slide.

Three things ran alongside the stake-floor removal. Deposit limits were surfaced in-session for any player whose late-night play exceeded their own 30-day average by 50%. The existing 90-minute continuous-play reality check stayed in place and was made non-dismissible for the test cohort. And a velocity flag triggered a mandatory cool-off prompt for accounts showing more than 400 spins in a two-hour window — a threshold that, at 10p stakes, is now reachable by players who'd never have hit it at £5.

That last point is the one to watch. Lower minimums change which players trip which thresholds. A velocity rule calibrated for a £5-floor world will fire differently — and later, in cash terms — once someone can spin 400 times for £40. If you lower the floor without re-tuning the triggers, your safer gambling controls quietly loosen.

What the operators didn't measure

The published result covers four weeks. That's enough to see a behavioural shift and nowhere near enough to see whether it persists, whether it attracts a new segment of lower-spending players, or whether it converts some low-stake players into higher-stake ones over months. The trial also excluded anyone with a self-exclusion history or an active deposit limit below £50 a month, which is sensible for a clean read but means the cohort skews less vulnerable than the real late-night population.

There's no data in the release on complaints, on time-to-first-deposit-limit-set, or on session length in minutes rather than spins. Those are the numbers a regulator would want.

Why the £5 floor existed, and why it's going

The £5 minimum was never a player-protection measure in any meaningful sense. It arrived as a commercial convention — a way to keep average stake per spin high enough to make small-stakes traffic worth the operational cost, and to deter the card-testing and bonus-abuse accounts that cluster at the lowest stake denominations. That second function is real. Low minimums are attractive to fraudsters because they let them test stolen payment credentials cheaply.

The trial operators handled this with per-account velocity caps on deposit methods rather than a stake floor, which is the right tool for the job — a stake floor was always a blunt proxy for fraud control. If the 21% figure encourages other operators to drop floors, the fraud controls need to move with them. An operator that removes the £5 minimum and leaves payment-method testing limits untouched is asking for trouble.

There's also a competitive angle. The £2.50 ceiling on slot stakes that came out of the 2023 white paper consultations reset the top of the market; the bottom of the market is now where product differentiation lives. A 10p minimum is a marketing claim as much as a product decision, and the operators that move first get to own the "play from 10p" positioning.

The open question: does the lift survive scrutiny?

The 21% number is real within its own terms, but it measures spins, not players, and it covers a window that regulators are watching closely. The honest reading is that a £5 floor was suppressing low-stakes late-night play among casual players, and removing it recovers that play — which is a legitimate product outcome, provided the safer gambling thresholds are recalibrated for the new stake distribution.

The question the industry hasn't answered is whether the 21% represents recovered engagement or newly generated play. If it's the former, the players were always there and the floor was just in the way. If it's the latter — if smaller stakes are drawing people into longer late-night sessions who wouldn't otherwise have played — then the number is a warning dressed as a win. Distinguishing the two needs session-level data over at least six months, and no operator has published that yet. Until one does, treat the 21% as a prompt for better measurement rather than a green light.