How UK betting promotions are regulated
Promotions offered to customers in Great Britain must follow the Gambling Commission's rules and advertising codes enforced by the Advertising Standards Authority. Since January 2026 two further rules apply: wagering requirements attached to any bonus are capped at ten times the bonus amount, and promotions that mix different gambling products are banned. An offer can no longer require you to bet on sport to unlock casino spins, or the other way round.
Significant terms must also be displayed close to the headline offer rather than buried in a separate page. If you cannot see the minimum odds, expiry and whether the stake is returned without scrolling through legal text, the offer is not being presented as clearly as it should be.
The terms that matter most
| Term | Typical wording | Effect |
|---|---|---|
| Stake not returned | “Free bet stakes not included in returns” | Cuts the value of every winning free bet. |
| Minimum odds | “Min odds 1/2 (1.5)” | Stops you using the free bet on near-certainties. |
| Expiry | “Free bets expire in 7 days” | Unused tokens are lost. |
| Split tokens | “4 x £5 free bets” | Less flexible than one larger bet. |
| Market restrictions | “Selected football markets only” | Limits where you can use it. |
| Payment exclusions | “Some deposit methods excluded” | You may not qualify at all. |
Working out what an offer is worth
Consider a typical offer: place a £10 qualifying bet at odds of evens or bigger and receive £20 in free bets, stake not returned. The qualifying bet itself carries the bookmaker's normal margin, so over time you would expect to lose a little on it, perhaps 50p at a 5% margin.
The free bets are then worth less than £20. Because the stake is not returned, a £20 free bet at decimal odds of 3.00 pays £40 if it wins, not £60. If the true chance of winning is roughly one in three, the expected value is around £13 before margin, and a little less after. That is still a genuine benefit, but it is closer to £12 or £13 than to £20.
Rule of thumb
A stake-not-returned free bet is typically worth roughly 60% to 75% of its face value when used at sensible odds. Offers split into small tokens with tight restrictions sit at the lower end.
Understanding this calculation relies on implied probability, which we explain in our guide to how betting odds work.
Ongoing promotions for existing customers
For regular punters, repeat promotions can outweigh any welcome offer. Common types include price boosts, where the bookmaker temporarily offers bigger odds on a selection; acca insurance, which refunds a stake as a free bet if one leg lets you down; and loyalty or reward schemes that return free bets based on how much you stake.
Treat these with the same care. A price boost is only valuable if the boosted price is bigger than you could get elsewhere. Acca insurance usually applies only to accumulators with a minimum number of legs and minimum odds, which are exactly the bets with the highest margins. Rewards schemes based on turnover can encourage you to bet more than you planned, so it is worth asking whether you would have placed those bets anyway.
When to say no to an offer
You are never obliged to accept a promotion. Most betting sites let you opt out when you register, and you can adjust marketing preferences at any time. Declining offers is sensible if the terms are unclear, if the offer would push you to bet on markets you do not normally follow, or if you are trying to cut back.
If you have set a deposit limit, as described on our responsible gambling page, a promotion should never be a reason to raise it. The rules on promotions exist partly because offers have historically encouraged people to gamble more than intended.
Offers and account restrictions
Bookmakers monitor how customers use promotions. Accounts that only ever take offers and rarely bet otherwise may find future promotions withdrawn or stakes limited. This is within the operator's terms. If promotions are central to how you want to bet, read the general terms on bonus abuse and multiple accounts, which are usually broad.
Frequently asked questions
It means a winning free bet pays only the profit, not the free bet amount itself. A £10 free bet at odds of 3.00 returns £20 rather than £30.
Since January 2026 the Gambling Commission caps wagering requirements on gambling promotions at ten times the bonus amount. Many sports free bets have no wagering requirement at all.
Yes. You can usually opt out during registration or in your account settings, and you can change marketing preferences at any time. Declining an offer does not affect your ability to use the site.