On 12 December 2025, 38 days before Britain’s new bonus rules took effect, the Gambling Commission published a guidance table of example promotions and marked each one yes or no. “Spend £5 on casino products and get 20 free spins” passed. A daily prize game offering a “£1 free bet, 5 free spins, or £10 cash” failed, though nobody had to stake anything to enter, because its prizes mixed two kinds of gambling.
The cap that arrived with the mixing ban on 19 January 2026 matters more to anyone asking which casino bonus is best: Commission licensees may no longer make a customer play bonus funds through more than ten times before withdrawing. This is the first October in which a licensed British offer has had a regulatory ceiling on that number. So that question has an honest answer, though it is a set of criteria, not a list, and the largest figure on any promotion is the least informative.
Table of Contents
Five numbers do the work the headline can’t
Start with the multiple. A wagering requirement is the total a customer must stake before bonus money, or anything it wins, becomes withdrawable, and terms usually quote it as so many times the bonus. On £40 of bonus funds, ten times means £400 of stakes. Thirty-five times means £1,400. Weighting then sets how much of each stake counts towards that total, game by game; it is the easiest yardstick to miss.
Expiry turns the total into a pace. Required stakes of £400 inside seven days work out at about £57 a day; over 30 days, nearer £13. The window leaves the bonus unchanged and sets how hard the play is pushed.
A maximum cash-out caps what bonus play can turn into withdrawable money: with a £100 cap, anything above £100 stays behind. It matters least on an ordinary day and most on an unusual one.
Spin offers carry their real size in the stake per spin. A hundred spins at 10p put £10 of play on the reels and twenty at £1 put £20, so the smaller headline holds twice as much. Whether spin winnings arrive as cash or as bonus funds with a multiple of their own matters just as much.
Given only two of the five, I’d read the multiple and the weighting together, because either alone misleads. The other three can spoil an offer with a light multiple but never rescue one with a heavy multiple.
One international site runs its offers in layers
Those yardsticks work offer by offer, and a single casino site can run several offers at once, each written for a different stage of a customer’s time with it. The first job is knowing which layer an offer belongs to.
The homepage of 24casino.net, an online casino brand with its site in nine languages, sets that structure out. It describes a spins offer that needs no deposit for new accounts, then a welcome package spread across the first four deposits, each step a percentage match with spins attached. Beyond those sit ongoing promotions and loyalty rewards for returning players, and a layer of seasonal and special-event promotions.
Each layer puts a different yardstick first. The no-deposit spins turn on the stake per spin and on any cap on what their winnings can become. The deposit ladder is four offers rather than one, so the multiple and the weighting need reading at every step. A month-specific promotion sits in the seasonal layer, where expiry comes first, because an offer built around a date runs on its own clock.
Britain’s cap fixes the multiple, not what counts towards it
The rewritten bonus rules also require terms to be clear, transparent, fair and readily accessible. What they cap is the multiple printed in those terms. How much of each stake counts towards it is still the operator’s call.
The Commission’s consultation response sets out an example raised by respondents: a bonus carrying ten times, counted in full on slots, with roulette weighted at 30 per cent, so each £1 staked on roulette contributes 30p. On a £100 bonus, that is £1,000 of qualifying play, which means about £3,333 of stakes on roulette alone. A ten-times offer can ask for far more than ten times.
The Commission noted that operators weight games mainly to balance customer engagement against their own exposure to financial risk, and judged that the evidence did not yet justify reviewing rules on weighting. The rewrite did keep an older rule on pace: an offer may not grow in value because the qualifying spend is reached early.
All of these rules bind licence holders, so the register comes before any headline. UK players should only use operators whose licence shows as active on the Gambling Commission’s public register, which also lists expired, surrendered and revoked licences.
Ten times works as a yardstick outside Britain too
For readers elsewhere, Britain’s ceiling still makes a useful reference line: an offer well above ten times carries a multiple no British licensee may now apply, and one at or under it has passed only the first of five tests. On that reading, the best offer this month carries the lightest real multiple once weighting on the games actually played is counted, with nothing in the other three numbers to spoil it.
No bonus term reaches inside the games. A random number generator decides each result in a digital casino game, the house edge holds with or without a bonus on the balance, and no offer turns play into income.
For anyone in Britain who finds gambling harder to stop than to start, 0808 8020 133 reaches the National Gambling Helpline from England and Scotland, and 0808 2819 265 the NHS Wales helpline. Both numbers are free and open 24 hours a day.
Headline figures will move on with the calendar. The offer that passes all five tests this month may well be smaller than the ones around it.
