Best Bet Builder Betting Sites in Great Britain

Updated October 2026

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Available in US

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A bet builder folds several selections from the same match into a single wager. Sky Bet calls its version BuildABet. At its simplest, it lets a punter pick the result, both teams to score, and the number of corners in one football fixture, and price the lot as one line on the slip. That single change — bundling outcomes that used to live as separate singles — is what the rest of this page traces.

Last reviewed: October 30, 2026, against the Gambling Commission’s public register of remote operating licences.

What a bet builder actually does

A bet builder is a same-event accumulator. The punter chooses two or more selections from one match, race or fight; the bookmaker multiplies the decimal prices into a combined price; the bet settles as one line. There is no prose holding them together; the multiplication is. A four-folder at decimal prices of 1.90, 2.10, 1.70 and 2.50 settles at roughly 17.0 — a price that would not appear on any single market on the betting site because it is built from four of them.

The mechanics matter because they decide what a bet builder costs. Because each leg is a real market, the margin inside the combined price is the margin of those four markets, multiplied together. That is the under-the-bonnet bit the marketing line skips past, and it is the one that decides whether the price is generous or ordinary. A real price of 17.0 on four selections whose individual margins sum to a touch over 7% is unremarkable. The same 17.0 on four selections whose individual margins run to 9% is thin.

There are ceilings. Sky Bet’s BuildABet tab allows up to 10 selections in a single bet builder, and a betslip can carry 20 selections across several same-event builders. Add a contradictory selection and the price disappears — a team to win 2-0 combined with Over 2.5 goals is the kind of pairing the bookmaker will refuse to price, because the two legs cannot both win. Markets are eligible only through the dedicated tab; not every market from the event page can be folded in.

Void legs behave in a way bettors regularly misread. If one selection in a bet builder is void, the remaining selections keep running and the price reverts to the multiplied odds of those. A four-folder with one void leg settles on three legs at the price those three multiply to. That is not a refund; the price moves, and it moves down.

How the combined price is built

Decimal prices multiply. A leg at 1.91 folded with a leg at 2.50 produces a combined price of 1.91 × 2.50 = 4.775. Add a third leg at 3.40 and the price becomes 4.775 × 3.40 = 16.235. The stake is multiplied once, by the combined price: a £10 bet at 16.235 returns £162.35 if every leg wins. None of this requires a calculator, although every major bookmaker offers one inside the betslip; what the calculator does is the same arithmetic the punter could do on the back of the slip.

Fractional prices convert to decimal by dividing the numerator by the denominator and adding one. Five-to-one becomes 1 + 5/1 = 6.00. Eleven-to-four becomes 1 + 11/4 = 3.75. Once converted, the multiplication works the same way. The format is just notation.

Why a builder bet differs from a regular accumulator

A standard accumulator pulls one selection per event across separate matches: a win in the early kick-off, a draw at three o’clock, an away win at five. A bet builder pulls several selections out of a single event. The two look similar on the slip — both are combination bets whose prices are multiplied — but the risk profile is different. The early kick-off drifting 2-0 does not affect the late match’s coupon; a single goal in the first half of one football fixture can swing three or four legs of a same-event builder at once.

That is also why the maximum number of selections on a builder tends to be lower. A 20-leg Premier League acca is unusual but possible; a 20-leg bet builder is not, because most fixtures do not have 20 independently-priced markets the bookmaker is willing to combine. Ten legs is the ceiling Sky Bet publishes, and the comparable limit at the bigger operators sits in the same range.

What a bet builder costs the bettor

The price carries the margin of each leg, compounded. A bet builder at 4.775 on two legs with individual margins of 5% each is not 10% overround; the mathematical effect is closer to 1 − 1/(1.05 × 1.05) ≈ 9.3%. Add legs and the effect compounds further: six legs each at 5% the compounded overround works out closer to 26% on the combined price. There is no defence of this against the punt — the bookmaker does not need to widen the line when the same compounded figure is built in.

The honest read: a bet builder’s price is fair only when each leg’s individual margin is competitive. The combined price looks generous because four short prices multiply into a long one, and the eye takes the long one at face value. That is the mechanic a sharp bettor watches.

The legal frame in Great Britain

Every operator reviewed on this page holds a remote operating licence issued by the Gambling Commission under the Gambling Act 2005, the statute that covers Great Britain — England, Scotland and Wales. Northern Ireland is outside the 2005 Act and is not covered by a Commission licence. Since the Gambling (Licensing and Advertising) Act 2014 any operator whose remote facilities are used in Great Britain needs a Commission licence wherever it sits; a Curaçao, Maltese or Gibraltar licence is not a substitute, and an offshore brand serves GB customers at its own legal exposure.

Betting licence types in scope: remote general betting standard (real events), the category covering football, tennis, horse racing and the rest of the live calendar. Remote general betting standard (virtual events) is a separate category. The licence for exchanges is remote betting intermediary. No statutory list of permitted bets or markets exists; an operator offers markets under its own rules and the Commission’s Licence Conditions and Codes of Practice.

A customer-facing point: the Commission verifies name, address and date of birth before a first deposit — in force since 7 May 2019 — including on accounts funded with a free bet or bonus. There is no anonymous play at a licensed site.

Verifying a licence yourself

The Commission’s public register can be searched by business name, trading name, domain or account number. A licence line printed in a footer is a start; the register is the test. The account number printed there is the entry point — paste it into the register, confirm the licence holder, the trading name and the licence status, and the chain is closed. No count of GB-licensed online operators should be quoted without an access date, because the register changes weekly.

In-play, esports, novelty markets

GB-licensed bookmakers offer in-play betting under their own licence conditions and customer-protection duties; the controls are the operator’s. There is no statutory list of permitted in-play markets and there is no rule against in-play on a given sport. Esports are treated as another event category. Bets on politics, television and novelty markets are offered by GB bookmakers, and no statutory prohibition was found. Spread betting on financial instruments is regulated by the Financial Conduct Authority, not the Commission.

What changes for the player

Player-facing differences between a licensed brand and an unlicensed brand come down to checks and protections. On a licensed site: GAMSTOP covers online play, the 10x wagering cap on bonuses is enforced, the £150 rolling-30-day vulnerability check applies, deposit limits are a regulatory requirement and the Commission’s dispute route exists. On an unlicensed site: none of those apply. Funds held by an unlicensed brand have no British consumer redress if they are withheld; advertising standards are not the ASA’s; the 10x cap and the £150 check are not enforced. The framing is honest: licensed is not automatically the safer choice, but it is the one with the backstop around it.

Responsible gambling tools and where help sits

Player-protection rules have moved more in the last two years than in the previous decade. The headline items a punter meets when they open a new account at a licensed bookmaker:

• GAMSTOP. A national multi-operator online self-exclusion scheme, mandatory for online licence holders since 31 March 2020. Periods are six months, one year, five years, or five years with auto-renewal; after the minimum period the exclusion stays in place for a further seven years unless the customer asks to be removed. Coverage is online only — betting shops use a separate service.
• Identity and age verification. Name, address and date of birth verified before the first deposit, in force since 7 May 2019, and including free bets and bonuses. Minimum age 18.
• Financial vulnerability check. A public-record check (bankruptcy, county court judgments) — not an income or credit-reference check — for customers whose net deposits exceed £150 in a rolling 30 days, in force since 28 February 2025.
• Financial risk assessments. Affordability checks have been announced in a staged plan, with no start date — write them down as announced, not as in force.
• Deposit limits. Operators must offer gross deposit limits on a fixed time frame. The first phase applied from 31 October 2025; a second phase was postponed to 30 September 2026. Whether it is live is not established.

Where help sits: GamCare runs the National Gambling Helpline. GambleAware funds treatment and education. The NHS runs gambling clinics across England. None of these is a betting site; all three are free.

Bonuses, free bets and the wagering cap

The promotional frame around bet builders has tightened substantially. Promotion rules in force since 19 January 2026 cap wagering requirements on bonuses at 10x. A £10 bonus previously tied to a 50x playthrough — £500 of qualifying bets to clear — is now capped: no more than £100 of qualifying bets per £10 of bonus. That is the regulatory ceiling; many brands run well below it.

What that cap does not cover is not established either: whether the cap applies to free bets with no wagering condition and whether there is a state-side cap on the money value of a bonus are open. The honest read is to read each operator’s own terms page for the exact figure, because the floor and the cap are set by different rules.

Mixed-product promotions

A promotion that requires gambling on two or more product types — betting and casino, betting and bingo, betting and lottery — is banned under the same rules. The example the Commission’s guidance uses is “bet on football to get free spins”; that structure is out. Single-product offers — a sportsbook free bet, a casino bonus — remain in scope and follow the 10x cap individually.

Free bets and the stake that does not come back

A free bet is a stake the operator gives the punter and which does not return with a win. A £10 free bet at decimal odds 3.00 that wins pays £20 — £10 of winnings, the £10 stake is not added. That single fact is the one a punter needs to value a free bet at all. The average value of a £10 free bet at odds 3.00, on a market with a 95% payout share, works out to £10 × (3.00 − 1) ÷ 3.00 × 0.95 = £6.33. Higher odds raise the value; a heavier margin cuts it.

Welcome packages typically seen at bet builder bookmakers

The packages are described qualitatively only. Spreadex offers £60 in free bets tied to a £10 fixed-odds qualifying bet, with the free bets usable across fixed odds and spread betting and a 28-day qualifying window. Betway offers £40 in free bet tokens in four £10 tranches, credited on settlement of a first bet of at least £10 at minimum odds of 2.0, with a 7-day expiry and debit-card deposits only. BetTom offers 50% back as a free bet up to £50, with a parallel 50% back up to £50 as free slot funds for casino play. Each comes with its own terms, and the terms are what make one offer worth more than another to a particular reader.

Mobile apps and the bet builder experience

A bet builder is built on a phone most of the time now. The screen real estate is small and the inputs are large; the slider or tab interface at the bigger operators is the answer to “how do I fit six selections on one screen”. Apps tend to do this better than mobile browsers, because the app can hand off a long-running betslip state between screens and remember selections as the punter moves through different markets.

App ratings are not a measure of bet builder quality specifically. They are a measure of the operator’s overall app — login, deposits, navigation, withdrawal flow. A 4.7-star app with a thin bet builder is still a 4.7-star app. The honest test is whether the bet builder tab is reachable in two taps from the event page, and whether the betslip holds selections as the punter moves between markets. Most of the bigger operators get this right.

App Store age ratings

A note that is worth its paragraph: the App Store age rating on a gambling app is 17+ in the UK, which sits above the legal minimum age to bet (the legal age is 18, and the rating is conservative). The rating is set by the platform, not by the Gambling Commission. It is not a substitute for the operator’s own age verification at sign-up.

Live betting, in-play builders and cash out

In-play betting takes a same-event builder into the match. The bet builder tab on a live football match offers the same markets as the pre-match tab — result, both teams to score, total goals, corners, cards — repriced every few seconds by the operator’s trading team. The mechanics are unchanged. The compounding on each leg works the same way; the margin is what the operator quotes at that moment. Cash out settles the bet builder before the match finishes. The cash-out value reflects the current state of each leg — a 2-0 first half in a six-leg builder that included a BTTS leg will read as a partial cash-out because one leg is already decided, and the price will move accordingly.

The mechanics matter here because cash-out on a bet builder is harder for the operator to price than cash-out on a single. The bookmaker has to model the joint probability of the remaining legs and offer a value that holds its margin. At a deeper link, a partial cash-out on a bet builder is sometimes not offered at all. Where it is offered, the value is usually materially below the live equivalent price of the remaining legs.

What “in-play” tells you about the operator

A thin in-play menu tells you the operator is small. The bigger the trading team, the more markets are repriced in-play, and the more of those markets are folded into a bet builder. A bookmaker with 40 in-play markets on a Premier League match can offer a richer builder than one with 8. The wider menu is also where novelty markets live — shots on target, player to be booked, goalkeeper saves — and where a builder becomes more than the standard four-leg line.

Predictions and strategy: what a bet builder actually needs

A bet builder is a pricing exercise, not a prediction one. The punter who picks six outcomes from one match and prices them at 17.0 has not predicted a 17.0 outcome; they have accepted a compounded margin in exchange for the long price. The strategy side is therefore narrower than for a regular accumulator. Three points worth making in full:

• Selection overlap matters. A four-leg builder with two legs that are near-copies of each other — Over 1.5 goals and BTTS Yes — pays less than the price of four independent legs, because the model treats them as correlated. Most operators do not refuse to price the pairing; they just price it tighter than the same legs priced independently.
• Void-handling matters. A four-leg builder with one void leg settles at the price of the remaining three legs. A bettor who likes the void policy — many do — picks builders with a higher proportion of markets that can void cleanly (player markets, in particular).
• Leg quality matters. A builder built from legs whose margin is heavy is a thinner bet than the same builder built from tighter legs. The compounded price looks the same; the compounded overround does not.

That is the cover on which the rest of this page sits. None of it predicts a winner.

Bet types, odds and the bet builder’s place in the menu

The bet builder sits next to the single, the each-way and the accumulator on most modern betting sites. The each-way is two bets of equal stake — a win bet and a place bet — and the stake doubles; that is a different construction from a bet builder. A Trixie is four bets across three selections; a Patent is seven; a Lucky 15 is fifteen. These are multiples, not same-event builders, and the math of a treble differs from the math of a three-leg bet builder only in that the legs come from different events.

How British odds are written

British odds are written as fractions (5/1, 11/4, evens) or as decimals (6.00, 3.75, 2.00). The conversion is a/b → a ÷ b + 1. Odds-on means the price is shorter than evens — anything below 2.00 in decimals. The starting price is the SP, the price at which the bookmaker settles a horse or greyhound race in the absence of a taken price; best odds guaranteed (BOG) is a bookmaker rule that pays the SP if it is higher than the taken price. William Hill pays BOG on UK and Irish racing from 8 a.m. on the day of the race, on singles and multiples, with ante-post, tote and pari-mutuel bets excluded.

A margin worked out in plain English

Take a two-way market at decimal odds of 1.90 against 1.90. The payout share works out as 1 ÷ (1/1.90 + 1/1.90) = 1 ÷ (0.5263 + 0.5263) = 1 ÷ 1.0526 = 0.95. The margin is 1 − 0.95 = 0.05, or 5%. That is the figure carried inside the price — five pence in the pound kept by the bookmaker on every unit bet on this market, the rest returned to the bettors collectively through winning bets.

A bet at 1.90 is not paying 19-to-10; it is paying 19-to-10 minus the margin that sits inside each leg. The same arithmetic at 1.85 against 1.85 gives a payout share of 0.927 and a margin of 7.3%. The bookmaker keeps 7.3 pence per pound. That is what a bookmaker’s margin is — the share of every pound bet that the operator keeps over the long run. The reader of a betting page sees it as a percentage; the bettor feels it as the gap between a “fair” price and the price quoted.

A band, not a number: across a representative sample of football 1X2 markets at the bigger UK-licensed bookmakers, margins commonly run in the 4–7% range, with tighter markets on high-profile fixtures and wider markets on lower-tier or less-liquid interest, where the operator has less competition and less handle. The exact figure depends on the operator, the fixture and the moment; a margin printed without that context is a margin pinned to a snapshot in time, not to the market as it exists day to day.

The top ten bet builder bookmakers licensed in Great Britain

The ten operators below are the brands this page compares. Every one of them is licensed by the Gambling Commission for remote general betting standard (real events), and the licence number printed in the bedtable is the number the reader can paste into the Commission’s public register to confirm the licence holder, the licence status and the licence categories.

1. 10bet

10bet’s sportsbook covers football, tennis and horse racing, with cash out, a bet builder tab and live streaming listed on its App Store entry. The licence is held by Blue Star Planet Limited, with Commission account 43173. The brand sits in the mid-tier of UK bookmakers — not as wide a market as the giants, but with enough markets on a Premier League match to build a six-leg same-event bet. 10bet is most useful for the punter who wants a single account with casino and sportsbook side by side.

The brand’s terms on the bet builder key: the bet builder tab is enabled on football and a handful of other sports, with the usual menu of result, both teams to score, total goals and corners. Live streaming is available on selected events. The licence line is verified against the Commission’s register. For the punter who plays one brand across casino and sportsbook, 10bet is the cleaner of the mid-tier options.

2. BetTom

BetTom’s sports welcome offer is 50% back as a free bet of up to £50, paired with 50% back as free slot funds up to £50 for casino — full terms apply. The licence is held by Bet Tom Limited, with Commission account 64959. BetTom is a smaller brand with a tighter product focus. The bet builder is offered on football; the welcome offer’s structure, with a sportsbook leg and a casino leg, is exactly the kind of mixed-product promotion the January 2026 rules tighten against if it were a single offer with cross-product qualifying — but each leg is its own product, and the rules apply separately.

In terms of the bet builder: a standard football bet builder on result, both teams to score and goals markets; the welcome offer sits inside the rules. The honest read: the brand’s free-bet ceiling is modest and the matched casino leg is real but not generous. For the reader comparing £50-of-sportsbook-and-£50-of-casino against pure-sportsbook packages elsewhere, the value is the parallel structure rather than the headline number.

3. bet365

bet365 offers Bet Builder+, which combines markets from one event into a single bet, available pre-match and in-play. The brand layers Super Boosts, Winnings Boosts on Bet Builders and selected singles, and daily Bet Boosts on top. The licence is held by Hillside (UK Sports) ENC, with Commission account 55148. bet365 is the brand against which the rest of the page is measured: deepest in-play markets, widest pre-match menu, biggest live streaming library.

The brand’s terms on the bet builder key: Bet Builder+ is the named product, and the difference between Bet Builder+ and the basic version is the inclusion of player markets (shots, tackles, fouls) alongside the standard match markets. Winnings Boosts lift the price of a settled bet by a fixed percentage — a 10% winnings boost on a settled £50 bet at 10.0 returns an extra £45, the £50 stake plus £450 in winnings plus £45. The cost of the boost is built into the qualifying bet’s price and the eligibility rule. For the reader who wants the widest menu and the most in-play markets, bet365 is the benchmark; for the reader who wants a tighter brand to navigate, the menu is the cost of admission.

4. Spreadex

Spreadex is the unusual entry on this list. The brand is regulated by the Financial Conduct Authority for spread betting and by the Gambling Commission for fixed-odds betting; spread betting losses can exceed the deposit. The licence is held by Spreadex Limited, with Commission account 8835. The new customer offer is £60 in free bets for a £10 fixed-odds bet, with the free bets usable across fixed odds and spread betting, and a 28-day window from account opening.

Regarding the bet builder: Spreadex offers fixed-odds sports betting with a bet builder, and the same-account spread betting product that is the brand’s reason for existing. The reader who likes the spread product gets both sides of the bet from one account; the reader who only wants fixed-odds sportsbook has more direct options elsewhere. The honest read: a Spreadex account is for the punter who wants exposure to spread betting alongside fixed odds, not for the one solely interested in fixed-odds markets.

5. Betway

Betway’s welcome offer for new UK and Ireland customers is £40 in free bet tokens, paid in four £10 tranches, credited on settlement of a first bet of at least £10 at minimum odds of 2.0, with a 7-day expiry and debit card deposits only. The licence is held by Betway Limited, with Commission account 39372. Betway is one of the better-known mid-market UK bookmakers with a strong football product and a casino attached.

On the bet builder front: a standard football bet builder on result, both teams to score, total goals and a handful of player markets. The welcome offer’s structure — four tranches with a 7-day expiry — is worth reading in full because the £40 headline is paid in pieces; a punter who only places one qualifying bet gets the first £10 and the rest lapses. For the punter who plans to place four bets in the first week, the structure is fine; for the punter who only wants one, the offer is £10 against a £10 headline elsewhere.

6. Betboro

Betboro offers in-play markets and cash out on football, racing and tennis, with boosted odds on selected singles from £10 stakes, and responsible gambling tools including deposit limits, reality checks and self-exclusion. The licence is held by Webmedia Development N.V., with Commission account 44181. Betboro is one of the smaller names on this list and runs as a sportsbook-plus-casino combined product.

As for the bet builder: a bet builder tab on football and the major sports, with the standard match markets; the boosted-odds singles are not part of the builder and cannot usually be folded into one. For the punter who likes a smaller brand with a focused menu, Betboro is worth a look; if you prioritize the widest in-play menu, you might find more depth elsewhere.

7. Octobet

Octobet offers Best Odds Guaranteed on UK and Irish horse racing, up to £150 per customer per race. The licence is held by Octopus Game Limited, with Commission account 62545. Octobet is a racing-leaning bookmaker — the BOG ceiling is the headline — and the sportsbook covers the rest of the calendar with a standard menu.

As for the bet builder: a bet builder on football and the major sports, alongside the racing product. BOG on UK and Irish racing is the kind of concession that matters to a racing-only punter; on a football-led bet builder, the racing product is less central. For the punter whose mix is racing-led, Octobet is a sharper choice than the bigger brands; for the punter whose mix is football-led, the racing product is a side benefit rather than the reason to choose the brand.

8. William Hill

William Hill pays Best Odds Guaranteed on UK and Irish horse racing from 8 a.m. on the day of the race, on singles and multiples; the rule does not apply to ante-post, tote or pari-mutuel bets. The licence is held by WHG (International) Limited, with Commission account 39225. William Hill is the longest-established name on this page, with the broadest high-street heritage, and the online product carries the weight of that heritage across sportsbook, casino and gaming.

Bet builder mechanics: a standard football bet builder on result, both teams to score, total goals, corners and cards, with a player-markets layer on top. The BOG rule is the racing-led headline. For the reader who wants the broad-menu, heritage-brand sportsbook with a bet builder that covers the major markets, William Hill is the kind of brand the bet builder reader expects to see at the top of the page — which is why it sits in the middle of the list rather than the top: the bet builder is one product among many, not the brand’s lead.

9. Fitzwilliam Sports

Fitzwilliam Sports bases prices on Oddschecker’s average price for each selection and provides Apple and Google mobile apps. The licence is held by SBKI Limited, with Commission account 48760. Fitzwilliam is one of the smaller, price-led bookmakers — the headline is the average-price feed, and the rest of the product is a focused menu.

For the bet builder: a bet builder on football and the major sports, with the price advantage coming from the average-price feed. For the punter whose main concern is the price rather than the menu, Fitzwilliam is a sharper option than the bigger names; if you prioritize the widest in-play menu, the price advantage is sacrificed for those chasing maximum market coverage.

10. Lottoland

Lottoland UK combines casino, lottery betting, sports betting and scratchcards in one app, and states it is licensed by the Gambling Commission for customers in Great Britain. The licence is held by EU Lotto Limited, with Commission account 38991. Lottoland is a different shape from the other nine: the brand’s history is lottery betting, and the sportsbook is an addition to that core product.

When it comes to the bet builder: a standard football bet builder on the major sports, alongside a sportsbook menu that is broader than the lottery core but narrower than the dedicated sportsbooks elsewhere. For the punter who already has a Lottoland account for lottery betting, the sportsbook is a convenient addition; for the punter who wants a dedicated sportsbook, the menu is the cost of the combination.

Comparison table: the ten operators at a glance

How to read this comparison

The bedtable above is a licence check and a feature snapshot, not a ranking. Every brand listed holds a remote general betting standard (real events) licence; the account numbers are the entry points into the public register. The right column summarises what each operator’s own materials say on the bet builder key, and the differences across brands are larger than the table suggests. bet365’s Bet Builder+ is a different product from Fitzwilliam’s average-price builder, and William Hill’s heritage-brand menu is a different experience from Lottoland’s lottery-led sportsbook. The bedtable does not pick a winner, because none of the figures in it are a winner-picker.

Where the comparison does its work is in the joins. A punter who wants the widest in-play menu and the most live streaming gets a different answer from a punter who wants racing-led concessions; a punter who wants a combined sportsbook-casino-lottery account gets a different answer from a punter who wants a focused price-led bookmaker. The right brand depends on the right question, and the right question is the punter’s, not the page’s.

Frequently asked questions

What is a bet builder?

A bet builder is a same-event combination wager that combines two or more selections from a single match, race or fight into one priced line on the betting slip. The combined decimal price is the multiplied price of each leg. A bet builder is one bet, not several; the stake is multiplied once, by the combined price, and the bet settles as one outcome.

What is a horse racing bet builder?

A horse racing bet builder is the same construction on a race: several selections from the same race — finishing position, head-to-head match-ups, distance, going-related markets — folded into one priced line. Most racing bet builders cap the number of selections in the low single digits because racing events have fewer foldable markets than football. Each-way is not a builder; it is a parallel bet structure that doubles the stake.

How can it be checked that a bookmaker holds a Gambling Commission licence?

The Commission’s public register is searchable by business name, trading name, domain or account number. The licence line printed in an operator’s footer is the starting point; the register is the confirmation. Search by account number, confirm the licence holder’s name, the licence status and the categories, and the chain is closed. A GB-licensed online bookmaker uses a .com or a .co.uk domain interchangeably, and the domain does not prove the licence — the register does.

How is the return on a bet worked out from the stake and the odds?

Return equals stake multiplied by the decimal odds. Net profit equals stake multiplied by (decimal odds minus one), because the stake is returned with a win. A £10 bet at decimal odds 6.00 returns £60 — £50 profit plus the £10 stake. A combination bet’s decimal odds are the multiplied odds of the legs: two legs at 1.91 and 2.50 combine to 4.775, and a £10 bet at that price returns £47.75.

What is the bookmaker’s margin and how can it be seen in the odds?

The margin is the share of every pound bet that the bookmaker keeps over the long run. For a two-way market at decimal odds of 1.90 against 1.90, the payout share is 1 ÷ (1/1.90 + 1/1.90) = 0.95, and the margin is 1 − 0.95 = 0.05, or 5%. A wider margin means a thinner price; the same arithmetic at 1.85 against 1.85 gives a margin of 7.3%, and the operator keeps 7.3 pence per pound. A margin printed without a sport, market and snapshot is a margin pinned to a moment, not to the market as it exists day to day.

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