AI betting tips: what they cost, what they hide, and where the edge isn't

Updated October 2026

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Data current as of 30 October 2026, cross-checked against the Gambling Commission’s public register. Odds and offers age faster than anything else on this page — a price quoted without a date is described in words, not in numbers.

AI betting tips promise something that does not exist outside the maths: certainty, or near-certainty, about an event whose outcome nobody knows. The promise is built from real things — form, statistics, line-ups, head-to-head history, model outputs — but the framing is the trick. A model ranks probabilities. A bookmaker’s margin is hidden inside every price. A “free” tip still costs the punter time, the stake, and the slice of value the bookmaker has already taken. This guide is about the gap between the marketing and the maths, and what an AI-assisted tip actually does to a betting account. The angle throughout is cost, because cost is the only thing every punter pays regardless of which side wins.

How AI tips reach a phone: the app side of the market

A betting app is the first surface most UK punters meet, and the surface most AI tipsters sell through. The hand it lives on is also the surface most operators optimise for first — Bet Builder, in-play odds, cash out, push notifications for “price boosts” — so an AI-tipping service that wants the same attention has to live there too. The angle of this guide is cost, so the first cluster is the one that decides what every tip costs in friction before a stake is even placed: the app that delivers the tip, the verification it runs before you can act on it, and the live markets it opens onto.

What a betting app is built to do

Three jobs matter to the cost of following AI tips on a phone. First, login and verification: every operator serving customers in Great Britain has to verify name, address and date of birth before the first deposit — a rule in force since 7 May 2019 and unchanged since. An “anonymous” tip that says “deposit and bet” cannot land at a licensed bookmaker without that check, and the check is the punter’s first time-cost on every new brand. Second, in-play markets and streaming: most AI tipping flows fire during a match, and the app has to keep an in-play market open at a price the model can be tested against. Third, bet builders and accumulators, which is where most AI tipsters push staking plans because the returns look larger than singles.

Where the cost hides in the app

A few app features change the cost of following a tip without the punter noticing. Cash out lets the bookmaker close a position before the event settles — useful for an AI tip that is going wrong, costly when the offer is “lock in profit” on a selection that then drifts back. Live streaming tied to a “funded account or a bet in the last 24 hours” requirement, as William Hill’s WHTV runs, costs nothing if the punter is betting anyway and a deposit-sized stake if they are not. Push notifications for “enhanced odds” and “price boosts” are bookmaker-paid placements, not neutral tips: the marketing word is “boost”, and the boost is real, but the boosted price still carries a margin. Bet Builder, by design, lets the operator build a multi-leg market from scratch — every leg carries its own margin, and a four-leg builder’s total margin is closer to fifteen per cent than to five per cent, the way a single market’s would be. None of this is hidden, but each line item is small enough that the total slips past a punter who is watching the tip rather than the slip.

How AI tips are built, and what the maths actually says

This is the cluster where the marketing lives, and where the marketing is most worth deflating. An AI tip is not a forecast. It is a probability, expressed as a price, that the punter is invited to back against the bookmaker’s own price. The cost side of that exchange is the subject of this section: what a tip is, what it costs to follow, and what no model can do.

Form, statistics, line-ups: what an AI model actually uses

The inputs are honest enough. Historical form, head-to-head records, shot and possession data for football, expected-goals and expected-assists models, serve and return patterns for tennis, weather and pitch report, current odds movement, and a model’s own weighting — these are the ingredients a serious tipster combines. An AI does it faster and with less selection bias, and the output looks compelling: a probability between zero and one for each side. The cost the marketing never mentions is that the probability is a model of the past applied to the present, and the past never repeats exactly. Line-up news twenty minutes before kick-off can change the probability by ten points and the price by less. The model that published at midnight is already stale by lunch.

What a value bet actually is

A value bet is a price that is bigger than the true probability once the bookmaker’s margin is taken out. If a model says a side wins 60 per cent of the time, the “fair” decimal price is 1 ÷ 0.60 = 1.67. Anything bigger than 1.67 — say 1.80 — is “value” in the technical sense, because the punter is being paid more than the chance warrants. This is the bettor’s edge. It is small, it is rare, and it disappears the moment a second punter backs the same selection at the same price. An AI tipster’s job is to find these windows before the price moves. The cost is discipline, because staking value bets without a bankroll plan is just losing slowly.

Staking and bankroll discipline

The maths here is older than any model. Flat staking — the same unit on every bet — costs less than progressive staking, where losses chase losses, and costs less than Kelly staking in the hands of a punter whose probability estimate is wrong by a few points. A bankroll of one hundred units, with one unit per bet, gives a hundred bets of runway before ruin at flat stakes; the same bankroll on a martingale collapses inside ten. AI tips look technical because they come from a model, but the staking plan is the older and the more important layer. A punter who follows a model’s picks with no staking rule is paying for the model’s insight without protecting the bankroll that backs it.

Why no tip is ever certain

Two reasons, and the second is the one nobody likes. First, a probability of ninety-nine per cent still loses one time in a hundred, and an event happens once. There is no second kick-off to test the model against. Second, the bookmaker’s price already reflects the bookmaker’s own estimate, plus the margin, and on a market with two or three well-informed operators the price is usually closer to the true probability than an outsider’s model is. The punter’s edge, when it exists, is a thin slice of the cake — a few per cent over hundreds of bets, not a single winning pick. Anyone selling a tip as certain is selling something that does not exist, and the cost of believing them is the stake and the time lost on the bets that came after the loser.

The ten UK bookmakers reviewed

A shortlist is a list of brands that have cleared the basic licence check and earned a closer look, and that is all a shortlist is. None of the names below is the only licensed UK bookmaker; the Gambling Commission’s register lists more than a hundred. The brands below are reviewed because they illustrate how AI-tipping services, in-play markets, bet builders and offers behave across the range, not because they are the only ones worth a look. Each review carries the operator’s name and what sets it apart in the comparison, because a bare list of names tells the punter nothing.

The table below shows the licence account the Gambling Commission public register lists for each operator, the company that holds it, and what each operator’s own terms say about the subject of this page. The licence number is the test the register runs; the operator’s own terms page is the test the punter runs. Both are read together.

The spread looks orderly on paper. The cost that does not show is the gap between a brand’s licence account and the way that brand actually behaves in the live market, which is what each review below addresses. A licence number is necessary, not sufficient.

William Hill — BOG and the live stream trade-off

William Hill pays Best Odds Guaranteed on UK and Irish horse racing from 8 AM on the day of the race, on both single and multiple bets; the rule excludes ante-post, tote and pari-mutuel bets. For an AI tip that names an early price, BOG is a partial hedge: the punter takes the morning price, and if the starting price is bigger, the bigger odds are paid. The cost sits in the WHTV streaming requirement — a funded account or a bet in the last 24 hours, and £1 on a qualifying race for live racing itself. A punter following racing tips through the morning pays that £1 whether or not the day’s bet is a racing one. The licence account is 39225, held by WHG (International) Limited. Worth it for the BOG-and-stream combination on racing, less so on sports where the brand carries the same margin as the rest of the high street.

Betfair — the exchange underneath, and the 90-minute rule

Betfair’s sportsbook carries in-play markets, Bet Builder and free live streaming of events such as UK and Irish horse racing and football, all inside the GB app. The feature most AI tipsters ignore is the 90 Minute Payout market — a settlement rule that pays out on the 90-minute result regardless of extra time and penalties, which changes the value calculation for cup ties where the model is rating the outright. The cost is that Betfair Sportsbook and Betfair Exchange sit under the same brand but on different licences; the sportsbook is on account 39439 (PPB Counterparty Services Limited), and the exchange runs on a betting intermediary licence. The punter pays a commission on exchange lay bets that does not exist on the sportsbook, which is why AI tips usually point to one and not both. Worth it for the price depth on major football and tennis; less so for the casual weekend punt.

Fitzdares — specials and antepost at a smaller scale

Fitzdares publishes cash out, accumulators, Lucky 15s, specials and antepost markets across horse racing, football, tennis, rugby, cricket, golf and American football, with in-play live odds on the app. The brand sits on the smaller end of the high street — licence account 400, held by Fitzdares Limited — and the specials market is where it earns its keep: prices on novelty and antepost selections that the big three do not always carry. The cost of the specials market is liquidity: limits on the bigger prices are smaller than the big three’s, and an AI tip that names a longshot can be only partially filled. Worth it for the specials depth, less so for high-volume singles.

London Bet — sports plus Pragmatic Play slots

London.bet’s app combines sports betting on football, tennis, horse racing, greyhounds, darts, golf, cricket, NFL, NBA, MLB and snooker with Pragmatic Play casino slots and live in-play betting, all under one account. The publisher is Thistle Bet Limited on account 66162. The cost is the casino footprint: a sports-only punter pays a smaller line-up of sports markets than a sportsbook-only brand, and the slots side pulls promotional weight away from the sportsbook. Worth it for the combined product; less so for a punter whose AI tip is on a sport that sits low on the in-house list.

Betmaster — the licence is real, the surface is thin

Betmaster.co.uk states it holds account 65699 under BM Solutions GB Ltd, registered in Malta. The brand has the licence, the register confirms it, and the GB app exists; the surface that AI tipsters actually use — in-play depth, bet builder, streaming, BOG — is thinner than the high-street three and most of the second tier. The cost of following AI tips through Betmaster is the price of being early on a market the brand has priced loosely, which sometimes wins and often loses. Worth it for early markets on lower leagues; less so for punters who want streaming and BOG on the same ticket.

Betfred — Bet Builder and Sub Switch on a familiar book

Betfred’s app features Bet Builder, Sub Switch, Racing Post data, Extra Places, live casino and bingo, all on account 39544 (Petfre (Gibraltar) Limited). Sub Switch is the rare feature that punishes a tip going wrong in a way a cash out cannot: it lets the punter substitute a player for another in a bet builder when a line-up changes, which protects staking plans built on a specific player’s prop market. The cost is the same as every high-street bookmaker — the margin on the underlying market, plus the margin on the bet builder layer above it. Worth it for football bet builders and racing extras; less so for sports the app carries a thin line-up on.

Sky Bet — the £30 free-bet token package

Sky Bet’s welcome offer for new customers is £30 in free bets, credited as three £10 free bet tokens after a deposit of at least £5 and a first single or each-way bet of at least 5p at minimum odds of 1/1. The licence account is 67370 (SBG Sports Limited). The cost is the structure of the tokens: each token is its own free bet with its own minimum odds, the stake is not returned with a win, and a token that loses costs the £5 qualifying bet and any staking plan that depended on the offer landing. The £30 headline is not a £30 profit — at minimum odds of 1/1, three tokens each winning at 1/1 produces three stakes’ worth of profit on three stakes’ worth of free bets. Worth it as a way to test the app and the in-play product; less so as a value play.

Star Sports — the independent’s pitch

Star Sports describes itself as the UK’s leading independent bookmaker, with virtual sports, casino and live casino alongside the sportsbook, on account 9177 (Star Racing Limited). The independent pitch is real — the brand is not part of one of the merged groups — and that affects price competition in racing more than anywhere else: an independent can hold a line the chains have already moved off, which matters for early-morning AI racing tips. The cost is the smaller product surface: fewer sports, fewer streaming events, less promotional weight. Worth it for racing and for novelty markets; less so for punters who want a single app for every sport.

BetUK — free bets with a tight exclusions list

BetUK’s free bets exclude virtual sports, esports and non-UK/IE horse racing, and minimum odds apply, on account 39198 (LeoVegas Gaming PLC). The exclusions list is the cost most punters do not read: a free bet that lands on an excluded market is a voided free bet, and a staking plan that depended on it has to be re-staked at the punter’s own cost. The brand sits inside the LeoVegas group, which means a casino product alongside the sportsbook. Worth it for the LeoVegas casino pitch and the UK/IE racing pitch; less so for esports and virtual sports punters.

Fafabet — BOG from 9 AM on a smaller book

Fafabet pays Best Odds Guaranteed on UK and Irish horse racing win and each-way bets from 9 AM on race days; if the starting price is bigger than the original price, the bigger odds are paid. The licence account is 57385 (Taichi Tech Limited). The 9 AM BOG is an hour later than the 8 AM the high-street three offer, and the cost of that hour is real for early-morning AI racing tips whose price moves fast. Worth it for racing punters who accept the 9 AM trigger; less so for the very-early price-takers.

The fundamentals: what every AI tip sits on top of

The fundamentals are the things the marketing does not vary, because they are the same on every site and the same on every betting app. They are the floor the rest of the page stands on: the price, the margin, the stake, the return. They are the place where cost stops being a marketing word and starts being arithmetic. Every AI tip ever sold is a price against the bookmaker’s price, and the gap between the two is the bet.

What the price actually means

A decimal price of 2.00 pays £2 for every £1 staked, including the stake. The punter’s profit is the price minus one, so 2.00 is evens — £1 profit on a £1 stake. A price of 1.50 is “odds-on” — the punter risks more than they stand to win, which is the standard shape of a favourite. A price of 6.00 is the punter risking £1 to win £5. The British fractional form of 2.00 is 1/1 (evens); of 1.50 is 1/2; of 6.00 is 5/1. A “starting price” or SP is the price the bookmaker settles at when the race starts, used on horse and greyhound racing where the price is set on the course.

How the bookmaker’s margin sits inside the price

The bookmaker’s margin — sometimes called the overround — is the slice of every pound bet that the bookmaker keeps on average. The way it shows in the odds is the cheapest lesson in betting maths there is. A two-way market priced at 2.00 / 2.00 is not a fair market: a fair market would be 2.00 / 2.00 with no margin, paying out £2 on every £1 regardless of which side wins. The trick is the payout share. Take the illustrative two-way market this page uses as an example, priced at decimal odds 1.90 / 1.90 (fractional 9/10 — an example, not a quoted price). The payout share is 1 ÷ (1 ÷ 1.90 + 1 ÷ 1.90), which is 1 ÷ (0.5263 + 0.5263) = 1 ÷ 1.0526, or about 95.0 per cent. The margin is the rest, or about 5.0 per cent — a band of roughly 4.7 to 5.3 per cent on this exact type of two-way market, depending on the rounding of the odds. That is the bookmaker’s edge on a £100 staked across both sides: roughly £5 kept, £95 paid back in the long run, whatever the outcomes. Real markets price tighter or looser, and a three-way market carries a wider margin again. A punter whose model says “I beat the margin” is a punter whose model must produce a probability higher than the bookmaker’s own by more than the margin, every bet, on average. That is the cost the tip has to cover before it pays.

What a stake of £10 at 3.00 pays back

The arithmetic is straightforward once it is written out. A £10 stake at decimal odds 3.00 returns £30 if the bet wins — that is the stake (£10) multiplied by the odds (3.00). The punter’s net profit is £30 minus the £10 stake, or £20, which is the stake multiplied by (odds − 1). A losing bet pays back £0 and the stake is gone. For a combination bet — an accumulator of four legs at 2.00, 2.50, 1.80 and 3.00 — the odds multiply into one price: 2.00 × 2.50 × 1.80 × 3.00 = 27.00. A £10 stake returns £270 if all four legs win, with a net profit of £260. The catch — and it is the catch that makes accumulators the punter’s most expensive habit — is that every leg carries its own margin, and the combined margin on a four-leg accumulator is wider than the margin on any one of the legs alone.

What a free bet is actually worth

A free bet whose stake is not paid back with a win is worth less than its face value, and the maths is the same as a payout minus the stake. The expected value is the free-bet amount multiplied by (odds − 1) divided by the odds, multiplied by the payout share of the market the free bet is being placed on. A £10 free bet at odds of 3.00 on a market with a 95 per cent payout share is worth £10 × (3.00 − 1) ÷ 3.00 × 0.95, or about £6.33 in expected value. That is the cost of “free”: the headline is £10, the expected value on a single bet is roughly £6.33, and the stake is not coming back. A free bet with the stake paid back — rare, and usually flagged in the terms — closes that gap.

The statute and the regulator: what the licence means

The legal frame around UK online betting has two jobs: it makes sure every operator serving British customers holds a Commission licence, and it gives the customer a register to check the licence against. The second job is the cheaper of the two and the more useful to the punter, because the register is public and the punter can run it before a deposit. This cluster is the legal frame, because every AI tip eventually lands on a licensed bookmaker’s slip, and the slip is governed by the rules in this section.

What the Gambling Commission does

The Gambling Commission is a non-departmental public body sponsored by the Department for Culture, Media and Sport. It licenses the whole commercial market under the Gambling Act 2005, which covers Great Britain — England, Scotland and Wales. Northern Ireland is outside the Act and has its own older law, so a GB licence does not regulate Northern Ireland, and a brand with a GB licence is not licensed in Northern Ireland by virtue of that fact. The Commission runs a public register that can be searched by business name, trading name, domain or account number, and a brand is “licensed” only when the register says so for a specific account number. There is no state monopoly and no cap on the number of licences; the register lists more than a hundred remote betting licence holders.

Why a Curaçao, Maltese or Gibraltar licence is not enough

Since the Gambling (Licensing and Advertising) Act 2014, an operator whose remote facilities are used in Great Britain needs a Commission licence wherever it is based — sections 33 and 36 of the 2005 Act as amended. A Curaçao, Maltese or Gibraltar licence is not a substitute for serving GB customers, and a brand that holds one of those licences only is unlicensed for the purposes of the GB market. Spreadex is a useful illustration: the brand is regulated by the Financial Conduct Authority for spread betting and by the Gambling Commission for fixed-odds betting, and the difference matters because financial spread betting and sports betting are licensed differently. The cost of betting on a non-GB-licensed brand is the loss of every protection the Commission enforces, which the next section sets out.

The verification before the first bet

Since 7 May 2019, every licensed operator has to verify name, address and date of birth before the customer can deposit or gamble, including with a free bet or bonus. The cost is a few minutes on the first deposit, the second deposit, and any time the operator has reason to re-check. A punter who wants to “try” a tip without identifying themselves has lost the choice at every licensed operator, and that is by design. The verification is what ties the customer to the LCCP, which supports every other protection in this section.

Credit cards, deposits and payments

Credit cards are banned for gambling in Great Britain since 14 April 2020 (LCCP condition 6.1.2), including credit-card-funded payments through an e-wallet. Debit cards and bank-based payments are not covered by the ban, and the licensed bookmakers all accept them. Identity verification before the first deposit means there is no anonymous play at a licensed site, and source-of-funds questions at higher spend are normal under the money-laundering rules. Whether there is a state-set list of permitted payment methods or a rule for or against cryptocurrency deposits at licensed operators is not established; describe payments from each operator’s terms, not from a regulator’s list.

Advertising and what may and may not appear in it

Advertising is not licensed by the Commission; it runs through the CAP Code (non-broadcast) and the BCAP Code (broadcast), enforced by the ASA, alongside the LCCP marketing conditions. CAP Code section 16 makes marketing socially responsible, keeps it from being of strong appeal to under-18s, and bars anyone who is or seems to be under 25 from being featured gambling or playing a significant role — a rule about who appears in the ad, not about who may bet. Promotion rules in force since 19 January 2026 cap wagering requirements on bonuses at 10x (a £10 bonus at 50x needed £500 of bets before the cap; under the cap no more than £100), and ban mixed-product promotions, such as “bet on football to get free spins”, that require gambling on two or more product types. The “whistle-to-whistle” rule — no betting ads on TV from five minutes before a live event to five minutes after, before the 9 PM watershed — is an industry code, not law; horse and greyhound racing are excluded. The Premier League clubs’ withdrawal of gambling sponsorship from the front of matchday shirts from the 2026/27 season is voluntary, not law.

Tax on betting winnings

GB betting customers pay no tax on winnings (general information, not advice; a professional gambler should ask HMRC or an adviser). General Betting Duty is the operator’s tax on gross profits, currently 15 per cent; from 1 April 2027 a remote rate of 25 per cent applies within it, while remote bets on UK horse racing, self-service betting terminal bets, pool betting and in-person betting stay at 15 per cent (HM Government policy paper of 26 November 2025). Until 1 April 2027 the remote rate stays at 15 per cent; whether operators pass duty on through odds is not established. The Commission’s statutory levy is a separate charge, not a tax. The punter’s cost is the bookmaker’s margin, not the duty.

The offshore side and what is lost

A GB licence is compulsory at the point of consumption. Providing gambling facilities in Great Britain without the licence the Act requires is an offence under section 33 of the Gambling Act 2005 — aimed at the operator, with penalties on summary conviction of up to 51 weeks’ imprisonment, a fine up to level 5, or both (six months in Scotland). No offence aimed at a customer who bets on an unlicensed site was found. The cost to a customer is the loss of every layer: no GAMSTOP coverage, no Commission complaints route, no approved dispute-resolution body, no British consumer redress if funds are withheld, and no protection under the 10x bonus cap or the £150 vulnerability check. Enforcement is disruption, not blocking: cease-and-desist notices, search-engine referrals, work with registrars, hosts and payment providers, and court-order DNS blocking powers the Commission has been given or is about to receive. Honest framing: licensed means checks, limits, GAMSTOP, the bonus cap, but also verification before the first bet. Unlicensed means none of those protections and possible loss of funds. Neither is “the safe choice” by default.

Safer gambling: the budget controls and where help is

This is the cluster the marketing never opens, because it is the cluster that tells a punter how to spend less. The angle of this page is cost, and the cost of gambling harm is the cost nobody wants to pay attention to. The section is short by design — a long safer-gambling section is itself a marketing tell — but every fact below is the fact that matters when a budget starts to slip.

Deposit limits and the customer’s own ceiling

Every licensed operator must offer a gross deposit limit on a fixed time frame. The first changes have applied since 31 October 2025, with a second phase postponed to 30 September 2026, and whether the second phase is live is not established from the public register alone. There is no state-set deposit or loss ceiling for betting; limits are the customer’s choice, and the choice is the cheapest cost control the punter has.

GAMSTOP and self-exclusion

GAMSTOP is the national multi-operator online self-exclusion scheme, and a mandatory licence condition for online operators since 31 March 2020. Periods are six months, one year, five years, or five years with auto-renewal, and after the minimum period the exclusion stays in place for a further seven years unless the customer asks GAMSTOP to remove it. It covers online sites and apps; betting shops use a separate service. The cost of enrolling is the loss of every licensed brand at once, which is the point.

Vulnerability checks and what they actually check

A financial vulnerability check (LCCP condition 3.4.4, in force since 30 August 2024) applies to licensed remote betting when a customer’s deposits minus withdrawals exceed £150 in a rolling 30 days (since 28 February 2025). The check is a public-record check — bankruptcy or county court judgments, for example — not an income check and not a credit reference check. Financial risk assessments, the “affordability checks” of the press, are announced in a staged plan (Commission article of 7 July 2026), with no start date.

Where help is

GamCare runs the National Gambling Helpline. GambleAware funds treatment and support. The NHS runs gambling clinics. Gamblers Anonymous runs peer-support meetings. BeGambleAware, GamCare, GAMSTOP, Gambling Therapy and the BGC appear on licensed operators’ safer-gambling pages — Unibet’s UK site is one example, with deposit limits, a Player Profile test, product restrictions and self-exclusion, alongside live chat and links to the same list. The cost of using them is zero, and the cost of not using them when a budget starts to slip is the highest cost on this page.

FAQ

Can AI help with sports betting at all?

Yes, in narrow ways: an AI model can sift form, statistics, line-ups and head-to-head data faster than a human, and it can output a probability the punter compares against the bookmaker’s price. The cost is that the model is not the bet — the bookmaker’s margin is, and the model’s edge has to beat that margin on average, not on a single pick. A model that picks 55 per cent winners against a market that returns 95 per cent of stake is a model that loses money in the long run.

Is AI prediction the same as a tip?

No. A prediction is a probability, and a tip is a price. The same probability can be tipped at odds of 1.80, 2.00 or 2.20, and only one of those is value. Most AI tipsters sell the probability with the price attached, which makes the value judgement invisible — the punter either takes the tip or does not, without seeing whether the price was the right one.

What is a value bet and why is no tip ever certain?

A value bet is a price bigger than the true probability once the bookmaker’s margin is taken out — the punter is being paid more than the chance warrants. No tip is certain because a probability of 99 per cent still loses one time in a hundred, and a match happens once. The cost of believing a “certain” tip is the stake and the bets that came after the loser.

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

The margin is the slice of every pound bet that the bookmaker keeps on average. It shows in the prices: a two-way market at 1.90 / 1.90 has a payout share of about 95 per cent and a margin of about 5 per cent — a band of roughly 4.7 to 5.3 per cent depending on rounding. Real markets price tighter or looser, and three-way markets carry wider margins. The punter’s edge has to beat that margin, every bet, on average.

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

The return on a winning bet is the stake multiplied by the decimal odds; the net profit is the stake multiplied by (odds − 1). A £10 stake at 3.00 returns £30 and produces £20 profit. For a combination bet, the legs multiply into one price: four legs at 2.00, 2.50, 1.80 and 3.00 produce 27.00, and a £10 stake returns £270 if all four legs win. The cost of a combination is the wider margin on the combined market compared with a single.

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