The Best Slot Sites & the Top 10 High Payout Slot Games in the UK 

Explore the top UK online casino sites for slots in 2024, featuring exclusive games, bonuses, mega jackpots, and the highest RTP slots. Find out where to play favourites like White Rabbit Megaways and Mega Joker for the best value and playability.

Top 5 Online Casinos for Slots 

With more and more software companies joining the competition and a glut of new online casinos springing up, the slot world has never been in ruder health. The average casino today has over 400 slots on their roster at any one time and the quality, innovation and inventiveness of these games is consistently impressive.

Naturally, punters seek the best value they can find, so having a decent Return to Player percentage (RTP) is essential if a new slot is going to become a hot ticket and join the pantheon of uber slots, like Starburst and Book of Dead. So, with that in mind, let’s have a look at the top UK online casinos for slots and then take a deeper dive into the 10 games that offer the best value, creativity and, most importantly, playability. 

Bet365 – Best UK Sites for Exclusive Slots

You can’t keep a big man down and this goliath of the game rattles out slot after slot of the highest quality. Bet365 host one of the most impressive Progressive Jackpot collections anyway, with games like Sisters of Oz and Book Of Atem both boasting top prizes of well over £7 million. This section is further enhanced by the “Dual Jackpots” on the site, which all offer a Community Jackpot that pays when it reaches £100,000 and the Weekly Jackpot that resets every 7 days. 

The “Bet365 Originals” are a series of slots unique to this casino and are seriously playable, with superb graphics. Slots like Eye of Wukong and Call of the Samba won’t be found anywhere else.  

Betfred – Best App for Playing Slots on Your Phone

The recent re-vamp has done wonders for the Betfred slots collection, taking it from a very good collection to a fantastic one. The best kicking off point is the “Featured” section, where you will find a handsome number of Exclusive games. The Betfred To the 9’s Lucky Tap game and Piccante Gold Blitz are two of the most-played of the only-seen-at-Betfred collective of slots.  

The “New” slots come thick and fast, with one of the highest turnovers every month of any online casino. All provided by the biggest names in software, there’s not a dud among them. The Big Bass range of slots continues to command an army of punters and Betfred has assembled a “Cruise Slots Tournament” section that showcases these fantastic fishy wonders by utilising the Progressive Drops & Wins tool; this is the largest collective prize pool anywhere in the industry, promising up to £30 million in winnings every year. Big Bass Bonanza Keeping it Reel and Big Bass Amazon Xtreme are both worth getting your tackle out for. 

Explore more apps for playing slots with bonuses here.

Grosvenor Casino 

These aristocrats of the game may be famous for their smooth-as-silk Live Casino table games, but their slot collection is not just for the peasants. Incorporating the best software firms in the game, Grosvenor’s slot library is very much in their blue-blood tradition.  

They are superbly curated, with neat headings like “Originals”, “New”, “Popular” and “Grosvenor’s Hidden Gems” making life easy for the punter. The Hidden Gems include corkers like Zombie Carnival and Maria’s Marigolds.  

Since its invention in 2015, the Megaways slot engine has wowed punters with the huge array of win-lines it throws up and some of the most popular slots in history have undergone a Megaways makeover. Grosvenor has a section devoted to these Megaways marvels and it includes Monopoly, Fishin’ Frenzy and Gonzo’s Quest Megaways slots. A must-visit section for all players who love their slot-play to be super-charged. 

Magic Red 

These guys have put together a superb all-round casino, with a decent sportsbook and Live Casino section set off nicely by the impressive slot collection. Famous for the sheer number of “New” games on offer, Magic Red all always willing to give a first start to some fantastic novice numbers, including Majestic Winter Polar Adventures and the zany new Gansta-fishing mash-up Bad Bass. 

The Drops & Wins chapter is equally impressive, with some stunning games all offering the potential of a mega pay-day provided by the Drops & Wins Progressive network. Try out The Hand of Midas and Wild West Gold to see what all the fuss is about. 

Spin Rio 

Slap on the sun cream and get your Samba moves going because it’s carnival time at this slot-laden sunny site. Always one of the most aesthetically-pleasing online casinos, Spin Rio also delivers the goods as a major spinning-centre for slot fans.  

All the big guns are here; Starburst, Book of Dead and Immortal Romance included, but it is the vast number of “New” games that has put Spin Rio on the map. Titles like Spies Operation Fortune, Paddy O’Plunder and Sticky Bandits Unchained have all become smash-hits in no time.  

If you fancy going up a gear or two, be sure to visit the Spin Rio Jackpot section and play for some seriously mega pots. King Kong Cash, Bison Rising Megaways and Crabbin’ For Cash are all from the Jackpot King range and have regular payouts exceeding £5 million.  

Best UK Online Casino Sites for Slots: Exclusive Games & Mega Jackpots

Bet365Impressive Progressive Jackpot collection, Bet365 Originals. Promo code: USB365Tops slots: Sisters of Oz, Book Of Atem, Eye of Wukong, Call of the Samba
BetfredExclusive games, High monthly new slots turnoverTops slots: Betfred To the 9’s, Piccante Gold Blitz, Big Bass Bonanza Keeping it Reel
Grosvenor CasinoCurated slots with “New”, “Megaways” slot gamesTops slots: Zombie Carnival, Maria’s Marigolds, Monopoly Megaways
Magic RedNew games debut, Drops & Wins Progressive networkTops slots: Majestic Winter Polar Adventures, Bad Bass, The Hand of Midas
Spin RioAesthetic site with “New” games and Jackpot section, fast payoutsTops slots: Spies Operation Fortune, Paddy O’Plunder, King Kong Cash

Each of these casinos offers a distinctive slots gaming experience, from Bet365’s unique original titles and progressive jackpots to Spin Rio’s vibrant theme and new game offerings. Whether you’re looking for the thrill of a new slot or the excitement of chasing a progressive jackpot, these top online casinos in the UK provide a wide range of options for every slot enthusiast.

For the best casino bonuses in the UK check out this page.

UK’s Best Slot Sites With High RTP (Winning Odds) Games

    bet365 UK Casino Bonus: Get 50 Spins, Code: 365GMBLR
    5.0 rating based on 1 rating
    18+, The Bet365 sign up code is 365GMBLR . New customers only. Min deposit £10. Bet Credits available for use upon settlement of bets to value of qualifying deposit. Min odds, bet and payment method exclusions apply. Returns exclude Bet Credits stake. Time limits and T&Cs apply. The code can be used during registration, but does not change the offer amount in any way.
    Betfred Casino UK Bonus: Get 200 Free Spins
    5.0 rating based on 1 rating
    18+, New customers at Betfred UK casino can opt in and stake £10 on casino slots to get up to 200 free spins within 48 hours, expiring after 7 days; Promo code is optional. T&Cs apply.
    Betway Casino UK Bonus: Stake £10 & Get 125 Free Spins
    5.0 rating based on 1 rating
    18+, Get betway casino promo: New UK customers get 125 free spins on Big Bass Bonanza with a £10 deposit and stake, no wagering on winnings, debit card only, valid for 7 days, 18+, promo code is optional, full T&Cs apply.
    10bet Casino: Get 50% welcome bonus up to £250
    5.0 rating based on 1 rating
    18+, Activate a 50% bonus up to £250 at 10Bet Casino with code CASINO10, requiring a 50x wager on selected games within 30 days, excluding e-wallet deposits, for new players only.
    Buzz Casino Bonus: Get up to 200 Free Spins
    5.0 rating based on 1 rating
    18+, Start at Buzz Casino with our 2024 registration link, no promo code needed, and unlock an exciting welcome bonus designed for free spins lovers. Terms apply.
    Magic Red Casino Bonus: 100% Bonus of up to £35 + 50 Free Spins
    5.0 rating based on 1 rating
    18+, Magic Red Casino offers new players 100 free spins on Big Bass Bonanza with a £10 deposit, no wagering required.
    Grosvenor Casino Bonus: Deposit £20, Play with £50
    5.0 rating based on 1 rating
    18+, Deposit £20 at Grosvenor Casino to play with £50, leveraging a £30 bonus on selected games with a 30x wagering requirement.
    The Vic Bonus: Get up to £100 and 20 Free Spins
    5.0 rating based on 1 rating
    18+, Use “AGVIC” for The Vic’s welcome bonus: get a 100% match up to £100 plus spins on the first deposit.
    Spin&Win Casino Bonus: Get £100% up to £250 + 100 Free Spins
    5.0 rating based on 1 rating
    18+, The 2024 Spin and Win Casino Promo Code “AGSPIN” grants new users a 100% deposit match up to £250 and 100 Free Spins on Blueprint real money online slots, subject to friendly wagering requirements. Terms apply.
    Rialto Casino: Get up to £100 and Free Spins
    5.0 rating based on 1 rating
    18+, Unlock Rialto Casino’s welcome bonus with code AGRIALTO to play online games with up to £100 plus 50 free spins on first deposit, minimum £20, with tailored terms for subsequent deposits.
    Lucky Vip Casino Bonus: up to £100 + £7 Live Casino Offer & Free Spins
    5.0 rating based on 1 rating
    18+, Use Lucky VIP Casino bonus code AGVIP with a minimum first deposit of £20 to receive a 100% match up to £100 on selected slots and a guaranteed Live Casino bonus wheel spin up to £7, subject to a 40x wagering requirement and a 5x max conversion rate, with Live Casino bonuses playable on selected games.
    Spin Rio Bonus: Get £200 in 3 deposits and Free Spins
    5.0 rating based on 1 rating
    18+, Spin Rio Casino welcomes UK players with a vibrant carnival theme and offers up to £200 plus 100 Free Spins using the bonus code AGRIO.
    Magical Vegas Bonus: Get up to £300. Code: AGVEGAS
    5.0 rating based on 1 rating
    18+, Unlock the magic at Magical Vegas Casino with the AGVEGAS code for a 100% Matched Deposit Bonus up to £300 and 30 Free Spins, enhancing your online gaming adventure.
    Mr Play Casino: Get up to £200 on first deposit + Free Spins
    5.0 rating based on 1 rating

The Top 10 High Payout Slot Games in the UK 

Slot GameRTPFeaturesBest UK Casinos to Play
White Rabbit Megaways97.77%Over 240,000 paylinesBetfred, Grosvenor
Mega Joker99%Super Metre ModeVirgin Games, Unibet
Thunderstruck 296.65%Great Hall of SpinsBet365, Magic Red
Blood Sucker98%Vampire Slaying RoundGenting, Play Ojo
Jokerizer98%Jokerizer ModeBarz, Bet Victor
Rainbow Riches Pick ‘n’ Mix98%6 Bonus FeaturesRainbow Riches, Betfred
1429 Uncharted Seas98.5%Beautiful sea map settingBetfred, Bet365
Dead or Alive 296.82%Wild West themePaddy Power, Bet365
This table highlights the most generous RTP slots available to UK players, along with their unique features and the casinos where you can enjoy these top-rated video slots.

The top prize is always a big carrot, whether you are looking at a Progressive Jackpot from Mega Moolah or Jackpot King, with pots worth north of £5 million, or a more modest Daily or Weekly Jackpot. However, the key to any slot is always the Return to Player (RTP) percentage. This is the number of pounds returned to the punter, on average, from every £100 wagered. The higher the percentage the better!

Here are some of the most generous RTP slots on the UK online casino scene

White Rabbit Megaways 

You will love going through the looking glass with this cracker from Big Time Gaming. The Megaways engine supercharges the number of payline to over 240,000 and this high volatility 5-reeler has 4 different bonus features. But the standout feature is the huge 97.77% RTP that makes this game a must for all value seekers. Enjoy the Queen of Hearts in this beautifully rendered woodland setting with a haunting soundtrack. 

Best Casinos to play this slot; Betfred and Grosvenor. 

Mega Joker 

If camp and retro floats your boat, then climb on board this smooth cruiser! A fruity throwback (think smoky pub in 1973), the reels are full of familiar symbols like cherries and watermelons. Bets can range from 1p to £2, so all punters will be happy. Simplicity is the name of the game, although the Super Metre Mode can still deliver a 200x maximum win. Best of all is the staggering 99% RTP. 

Best Casinos to play this slot; Virgin Games and Unibet. 

Thunderstruck 2 

We are travelling to the icy north for this mythical adventure from Microgaming. Thor and his enormous hammer are to the fore, as is the punter-friendly 96.65% RTP. Packed with exciting features like the Great Hall of Spins and Wild Storms, this thriller has a maximum win potential of over 8,000x your stake. Try this game for real money and with bonuses at Lucky Vip Casino UK

Best Casinos to play this slot; Bet365 and Magic Red 

Blood Sucker 

Crucifixes and garlic at the ready for this vein-emptying shocker! The famous feature is the Vampire Slaying Round; this is unlocked when you stack up 3 stake and hammer symbols. Makers NetEnt brought this out in 2013 and, a decade on, this low-volatility game is still chilling the blood of players everywhere. At least the RTP of 98% will warm you up. 

Best Casinos to play this slot; Genting and Play Ojo 

Ugga Bugga 

With a very tasty 99.07% RTP, this slot has an unorthodox set-up, containing 10 sections. A simple, old-fashioned game in many ways, this is a perfect training ground for novice punters. From the Playtech stable, the theme is a Tiki Island getaway, with masks, coconuts and beach huts filling the reels. 

Best Casinos to play this slot; n/a 


With its enhanced portrait mode feature, this is the ideal slot to sample mobile play. Oh, and the 98% RTP is a pretty good inducement as well. From the funky outfit Yggdrasil, this slot is a basic fruit machine set-up with a few left-field twists, like the Jokeriser Mode that can soup up your top win to 6,000x your stake. 

Best Casinos to play this slot; Barz and Bet Victor 

Rainbow Riches Pick ‘n’ Mix 

From the famous and mega-successful Rainbow Riches line, this game has a 5 reel and 20 payline engine. From Barcrest, the upper limit on stakes can reach a heady £500 a spin, depending on the casino, making this ideal for high-rolling slot fans. 6 Bonus Features will keep you involved, as will the tasty 98% RTP 

Best Casinos to play this slot; Rainbow Riches and Betfred 

1429 Uncharted Seas 

From Thunderkick, this slot is a thing of beauty, set on an early map of the oceans, there are drawings of giant octopuses, mermaids and lobsters, all accompanied by a sweeping, almost orchestral soundscape. With a couple of exciting bonus features, even land-lubbers will get on board this fine vessel, not least for its wave-surfing 98.5% RTP.  

Best Casinos to play this slot; Betfred and Bet365 

The Catfather 

This one from Pragmatic Play will make you an offer you can’t refuse, starting with the purrfect 98.1% RTP. A tongue-in-cheek mobster-moggy mash-up, this slot is a scream, with natty hats and monocles setting the bonkers tone of kitty couture. Look out for the Kidnapped Mouse Scatter that can enhance your win by 20x. Silly? Maybe, but it will still have you feline good.  

Best Casinos to play this slot;  

Dead or Alive 2 

Hang ‘em High in this dusty cowboy slot from NetEnt, with a six-shooting 96.82% RTP. With features galore, including Wilds, Scatters and Free Spins, the atmosphere is superb, with feisty cowgirls and machete-wielding lunatics peppering the reels, along with sheriff badges and whisky. The maximum win is also over 111,000x your stake, so saddle-up and head to the Wild West. 

Best Casinos to play this slot; Paddy Power and Bet365. 

Get the Best UK Slot Site Bonuses: Exclusive Promo Codes for 2024

For UK slot enthusiasts searching for the best slot bonuses and exclusive promo codes, here’s a curated list to enhance your online gaming experience:

  • LuckyVIP Casino – Play slots with a 100% match bonus up to £100 plus an additional £7 for live casino action. Use promo code AGLUCKY to unlock this offer.
  • Rialto Casino – Secure a 100% bonus up to £300 along with 200 free spins for slot games. Claim this generous offer with the code AGRIALTO.
  • The Vic Casino – Take advantage of a 100% match up to £200 and 20 free spins by applying the code AGVIC during your deposit.
  • Spin And Win – Double your deposit with a 100% bonus up to £500, accessible with promo code AGSPIN.
  • Spin Rio – Spread over 3 deposits, grab up to £200 and 100 spins using the bonus code BGRIO.
  • Bet365 UK – Stake £10 and receive 50 bonus spins, plus up to 60 additional spins with the unique offer code USB365.

Are all these casinos safe to play?

Yes, they all use the latest SSL Firewall and encryption technology to protect all your online transactions AND are also licensed and registered by the UK Gambling Commission, so you know they are above board. 

Can you play all these slots on mobile devices?

Yes, they are all available in mobile and desktop versions. 

Do RTP’s on the same game vary from Casino to Casino?

They can do, so always check before playing. All RTP information for each game must be displayed, so you should never be in any doubt. 

Are online slot sites in the UK legal and safe to play at?

Yes, online slot sites in the UK are legal and safe, provided they are licensed and regulated by the UK Gambling Commission (UKGC). This ensures they adhere to strict standards for fairness, player protection, and responsible gambling.

How do I know if a UK slot site is fair?

A fair UK slot site uses Random Number Generators (RNGs) to determine the outcomes of its games, ensuring each spin is completely random and unbiased. Look for certifications from reputable testing agencies like eCOGRA or iTech Labs, which verify the integrity of online slots and gaming operations.

Can I play online slots for free at UK casinos?

Many UK slot sites offer free play versions of their slots, allowing players to try out games without risking real money. This is a great way to learn the mechanics of a new slot or simply enjoy playing for fun.

What are the most popular online slots in the UK?

Popular online slots in the UK include classics like Starburst, Gonzo’s Quest, and Book of Dead, as well as newer titles with innovative features and themes. These games are favored for their engaging gameplay, high-quality graphics, and potential for big wins.

How do I claim a bonus at UK slot sites?

To claim a bonus at UK slot sites, you typically need to register an account, make a qualifying deposit, and enter a promo code if required. Always read the terms and conditions to understand the wagering requirements and other conditions attached to the bonus.