Best online sportsbook UK is a shorter question than it looks, because most of the brands reviewed on this site were built around American state-by-state licensing, not the UK Gambling Commission. bet365 is the one name that clears that bar outright. BetMGM clears it too, with a wrinkle worth understanding before anyone assumes it's the same app their American friends use.
bet365: the UK-Born Default, and Why It Gained Ground in 2026
bet365 holds UK Gambling Commission license 55148 and has run out of Stoke-on-Trent since 2000 — this is the brand's home market, not an export. That mattered in 2026 specifically: the UK's Remote Gaming Duty, the tax on casino and gaming profit, doubled from 21% to 40% for accounting periods starting April 1, 2026. Sportsbook margin sits under a separate, lower tax (15% in 2026, rising to 25% in April 2027), so a sports-heavy book like bet365 absorbed less of the hit than a casino-led competitor. Blask, a third-party market tracker, reported bet365's UK betting share climbing from roughly 10.51% to 12.09% in the three months after the tax change took effect — one data provider's estimate, not an official Gambling Commission figure, but a consistent direction.
What actually changed in April 2026
- Remote Gaming Duty (casino/gaming profit): 21% → 40%, effective April 1, 2026
- Remote betting duty (sportsbook margin): stays 15% in 2026, rising to 25% in April 2027
- bet365 UK betting share (Blask estimate): ~10.51% → ~12.09% in the following three months
BetMGM UK Is Not BetMGM.com
This is the catch worth knowing before clicking anything. The BetMGM most of this site's American readers know is a 50/50 joint venture between MGM Resorts International and Entain, live in 23 US states plus DC. The UK version is a different corporate animal entirely: it launched in August 2023 run by LeoVegas Group, an MGM Resorts subsidiary, with sportsbook odds supplied by Kambi rather than Entain's own trading platform. Entain pushed back publicly at the time, saying MGM wasn't permitted to run the BetMGM brand on Entain's platform outside the US and Ontario — which is exactly why the UK operation exists as its own standalone, UKGC-licensed build instead of an extension of the American app.
Same name, two different companies: BetMGM US (MGM Resorts + Entain joint venture) and BetMGM UK (MGM Resorts' LeoVegas subsidiary, odds from Kambi) are run separately, launched separately, and licensed separately. A UK sign-up isn't a backdoor into the American product's state-by-state footprint.
What's Not Here, and Why
DraftKings is the clearest example of a brand this site covers extensively for US readers that simply doesn't apply in the UK anymore. It held a real UK Gambling Commission pool-betting license for a daily fantasy sports product — never a sportsbook — from 2016 until it shut the whole thing down on October 4, 2024, citing better growth in US sports betting. Bovada, BetOnline.ag, Kalshi, PrizePicks, and Polymarket are built around US offshore rules or US federal commodities law, none of which creates a UK product to sign up for. A UK resident doesn't need an offshore workaround the way a bettor in a dark US state might — the licensed market here, through bet365, BetMGM, Sky Bet, Paddy Power, and Betfair, already covers the demand those US-facing offshore brands exist to fill.
Ranked by what a UK bettor can actually open on this site's reviewed roster: bet365 first, as the UK-licensed, UK-headquartered default gaining share through 2026's tax shake-up; BetMGM second, a genuine UKGC-licensed sportsbook that just happens to be run by a different company than the one behind the US app of the same name. Treat either as entertainment, never income — 18+, and BeGambleAware.org if it stops feeling like that.
The short list
- 1. bet365 — UK-born, UKGC-licensed, gaining share in 2026
License 55148, operating out of Stoke-on-Trent since 2000. Blask's tracker reported UK betting share rising from about 10.51% to 12.09% in the three months after the April 1, 2026 tax increase, as sports-heavy books outperformed casino-led ones.
- 2. BetMGM — A real UK sportsbook — run by a different company than the US app
Launched in the UK in August 2023 via MGM's LeoVegas subsidiary, with Kambi supplying the sportsbook engine, after Entain blocked MGM from using the BetMGM brand on Entain's own platform outside the US and Ontario. Licensed, but a separate operation from BetMGM.com.
The honest verdict
bet365 is the honest answer for a UK bettor choosing between the brands reviewed on this site: it holds UK Gambling Commission license 55148, has operated out of Stoke-on-Trent since 2000, and a third-party market tracker (Blask) reported its UK betting share climbing from roughly 10.51% to 12.09% in the three months after the UK's Remote Gaming Duty jump on April 1, 2026 — sports-heavy operators gaining on casino-led ones as the tax bit harder. BetMGM is a real second name with a real UKGC-licensed sportsbook, but the structure is the catch: the UK operation launched in August 2023 through MGM's LeoVegas subsidiary with Kambi supplying the odds engine, specifically because Entain — MGM's 50/50 partner on the US BetMGM joint venture — would not let MGM run the BetMGM brand on Entain's platform outside the US and Ontario. A UK "BetMGM" account is a licensed product, just not a branch of the American one. Everything else this site reviews for a US audience is a no here: DraftKings held a real UKGC license for a DFS product from 2016 until shutting it down completely on October 4, 2024, and never ran a sportsbook in the UK at all; Bovada, BetOnline.ag, Kalshi, Polymarket, and PrizePicks are all built around US state or federal rules that simply don't reach a UK resident. None of this is a way to make money — it's 18+ entertainment with a house edge, licensed or not.
Questions this list actually answers
What is the best online sportsbook in the UK?
Of the brands this site reviews, bet365 is the clear answer — it is UK-headquartered, holds UK Gambling Commission license 55148, and gained market share through 2026 as the country's gambling tax rose. BetMGM is the other reviewed brand with a genuine UK sportsbook, launched in 2023 through MGM's LeoVegas subsidiary rather than the US joint venture most readers know. Outside this site's roster, Sky Bet, Paddy Power, Betfair, and Betfred are the UK market's other large licensed names.
Is BetMGM legal in the UK?
Yes, but it is a different company behind the brand. BetMGM UK launched in August 2023 run by LeoVegas Group — an MGM Resorts subsidiary — with Kambi powering the sportsbook, entirely separate from the 50/50 MGM-Entain joint venture that runs BetMGM.com in the US. Entain specifically objected to MGM using the BetMGM brand on Entain's platform outside the US and Ontario, which is why the UK version exists as its own licensed operation.
Is DraftKings available in the UK?
No. DraftKings held a genuine UK Gambling Commission pool-betting license for a daily fantasy sports product from 2016 to October 4, 2024, when it shut the product down completely and asked UK customers to withdraw remaining balances by June 3, 2025. It never ran a sportsbook or casino in the UK, and holds no active UK license today.
Can UK bettors use Bovada, BetOnline.ag, or Kalshi?
Not as a licensed UK product. Bovada and BetOnline.ag are built around the US offshore market and carry no UK Gambling Commission authorization; Kalshi is a US CFTC-designated exchange with no UK equivalent offering. None of them are the gray-market workaround a UK resident might assume — UKGC-licensed bookmakers like bet365 and BetMGM already cover the market these brands fill for US readers.
Why did bet365 gain market share in the UK in 2026?
The UK's Remote Gaming Duty — the tax on casino and gaming profit — doubled from 21% to 40% on April 1, 2026. According to Blask's market tracker, sports-heavy operators like bet365 picked up share in the months that followed while casino-focused brands without international revenue struggled more, since sportsbook margin is taxed separately (15% as of 2026, rising to 25% in April 2027) and wasn't hit by the same increase.