Best UK Slot Sites 2026 with Updated Rankings
UK punters often seek flexible casino sites. While GamStop remains mandatory for local brands, many players look for offshore-style perks. These alternatives offer massive bonuses and high stakes. Ten top-rated best slot sites provide modern options for 2026 players.
Choose Top Slots Sites Alternatives
Finding reliable sites requires checking licenses and security. These ten platforms provide excellent game variety and quick, secure withdrawals. They bypass national restrictions while maintaining high safety standards for every British user.
Comparing Top-Rated UK Operators and Their Standings
Identifying the right place to play involves looking at safety, game variety, and user interface. While many seek alternatives to traditional restrictions, established UKGC-licensed sites provide a benchmark for quality that helps players understand what to look for in any gaming environment.
Coral Casino
Coral stands as a titan in the British gambling sector, boasting a heritage that stretches back decades. Operating under a strict UKGC license, it ensures a high level of security and player protection that serves as a gold standard for the industry. This regulated environment provides peace of mind for those accustomed to the rigorous checks of the UK market.
The gaming library is vast, featuring over 2,000 distinct titles. Partnerships with industry leaders like NetEnt, Playtech, and Evolution Gaming ensure a high-quality selection of top slot sites and live dealer options. Players can find everything from classic fruit machines to the latest cinematic video slots with complex mechanics and high production values.
Newcomers can claim a £30 bonus after placing a qualifying wager of just £10. This straightforward promotion is accessible through their dedicated mobile applications, available for both Android and iOS devices. The app performance is smooth, providing a seamless transition from desktop to handheld play without losing functionality or visual fidelity.
Transaction processing at this site is efficient, supporting a wide range of traditional and modern banking methods. Whether using debit cards or electronic wallets, the system is designed for speed and reliability. Withdrawals are handled with professional urgency, reflecting the brand’s long-standing commitment to customer satisfaction and financial transparency.
- Pros: Massive game selection, reputable UKGC license, excellent mobile app.
- Cons: Strict wagering requirements, limited crypto support.
Virgin Bet Casino
Virgin Bet has quickly established a formidable reputation by leveraging a world-renowned brand name. It currently hosts more than 1,000 titles, focusing on quality over sheer quantity. The platform is designed for ease of use, making it a popular choice for those who value a clean interface and straightforward navigation.
The software lineup includes heavy hitters such as Pragmatic Play and NetEnt. This ensures that the games are not only entertaining but also fair and technically sound. The focus on these providers means players have access to some of the most popular and high-RTP games currently available on the market.
Promotions are frequently updated to keep the environment fresh for returning players. A modest £10 minimum deposit makes the site accessible to casual gamers who want to enjoy high-end gaming without a significant financial commitment. Payment methods are diverse, covering the most common preferences for UK-based users.
- Pros: User-friendly interface, low entry threshold, top-tier software.
- Cons: Fewer games than older rivals, no dedicated poker client.
Casumo Gaming Platform Details
Casumo operates under a strict United Kingdom Gambling Commission license, ensuring a secure environment for all players. This platform prioritises player safety through advanced encryption and regular audits of its random number generators. It stands as a reliable alternative for those looking for regulated options within the British market.
Gaming library is vast, featuring more than 5,000 distinct titles from over 60 top-tier software developers. Players can access popular releases from industry giants like Play’n GO and Evolution Gaming. This massive selection makes it one of the best casino slot sites available for UK residents today.
New members can claim a welcome package consisting of a 100% deposit match up to £100 plus 50 extra spins on selected titles. Beyond the initial offer, the platform uses a gamified loyalty system where players progress through levels to earn valuables and trophies. This unique approach keeps the interaction consistent and rewarding.
Technical infrastructure supports seamless transitions between live dealer tables and traditional video slots. Players can find everything from high-stakes blackjack to immersive game shows hosted by professional presenters. The inclusion of diverse providers ensures that the gameplay remains fresh with weekly updates to the catalogue.
- Massive library of 5,000+ games
- Regulated by the UKGC
- Unique adventure loyalty scheme
- High-quality live dealer section
- Fast payment processing times
- Mobile-optimised platform design
- Limited variety in sports markets
- Complex wagering requirements on some bonuses
Sky Bet Casino Operations
Sky Bet Casino presents a minimalist and professional interface dominated by a clean white aesthetic. Navigation is straightforward, allowing users to find their favourite titles without unnecessary clutter. The site performance remains stable across both desktop and mobile devices, catering to modern gaming habits.
A primary focus for this operator is the implementation of robust responsible gambling features. Users have access to a wide array of tools, including deposit limits, cool-off periods, and reality checks. These measures are integrated directly within the user interface to promote a healthy relationship with gaming.
The Sky Bet Club serves as the central pillar for ongoing player rewards. By meeting weekly wagering requirements, members can unlock various perks such as free spins or bonus credit. This system is transparent and provides consistent value to regular participants who prefer a structured reward environment without hidden conditions.
The platform also benefits from its integration with a wider network of gaming services, allowing for a unified account management system. This streamlined approach means that players can monitor their activity and balances with ease. The customer support team is available 24/7 to assist with any technical or account queries.
- Excellent responsible gaming tools
- Highly intuitive user interface
- Reliable weekly reward system
- Fast withdrawals to debit cards
- Strong brand reputation and trust
- Seamless mobile application performance
- Smaller game library than competitors
- Limited variety in live dealer options
JeffBet Casino Operations
JeffBet entered the market in 2022, providing a fresh perspective for players looking for modern features. New members can claim a 100% match bonus reaching £100, which includes 50 free spins for use on popular titles. This platform has quickly gained traction among those who value diversity and want to access a broad range of entertainment options.
The game library is vast, featuring thousands of titles from more than 50 top-tier software developers. The platform works seamlessly across different devices, allowing for smooth gameplay without technical interruptions or lag. This technical reliability ensures that sessions remain fluid regardless of the hardware being used by the player.
One standout feature of JeffBet is its approach to financial transactions. Unlike many traditional platforms, it supports both fiat currencies and digital assets like Bitcoin and Ethereum. This flexibility allows for faster processing times and caters to the growing number of players who prefer using decentralized payment methods for their gaming activities.
- Wide range of crypto payment options.
- Massive library of over 2,500 games.
- Higher wagering requirements on some bonuses.
- Limited customer support hours during weekends.
Betway Casino Platform
Betway stands as a highly regulated entity, holding licenses from both the UK Gambling Commission and the Malta Gaming Authority. This dual licensing ensures a high level of security and fairness for all participants. The site features a professional design that makes navigation simple, even for those who are new to online gaming.
The gaming catalog is heavily focused on quality, featuring over 400 slots primarily powered by Microgaming. Players can find iconic titles and progressive jackpots that offer significant payout potential. As one of the best winning slot sites, it maintains a reputation for transparency regarding return-to-player percentages across its entire portfolio of games.
New users are greeted with a welcome offer of up to £50, which provides a solid starting point for testing the various games available. For those who prefer gaming on the move, the dedicated mobile app offers a streamlined version of the desktop site, maintaining high visual quality on smaller screens.
- Strong regulatory oversight and security.
- High-quality Microgaming software integration.
- Smaller game library compared to competitors.
- Limited variety in live dealer options.
Monster Casino Features
Monster Casino provides an extensive collection of games sourced from numerous high-profile developers, ensuring a rich variety of themes and mechanics. The platform focuses on delivering a high-energy environment where players can find everything from traditional table games to the latest innovative slot releases.
The welcome package is particularly generous, offering up to £1,000 in bonus funds along with 100 free spins distributed over the initial deposits. This substantial incentive is designed to give players more opportunities to test the various categories of games without depleting their initial bankroll too quickly.
Payment options at Monster Casino are varied, covering major credit cards, e-wallets, and mobile payment solutions. While the site is fully optimized for mobile browsers, there is also a dedicated Android-only app available for download, providing a more tailored interface for users on that specific operating system who want a unified gaming environment.
- Very large welcome bonus package.
- Excellent mobile browser optimization.
- No dedicated app for iOS users.
- Withdrawal processing can be slow at times.
Party Casino Gaming Library
New players joining this platform receive 50 free spins to use on popular titles. Customer support remains accessible 24/7 to resolve any technical issues or account queries promptly. This ensures that help is always at hand regardless of when you choose to play.
The library boasts over 2,000 distinct titles, ranging from classic reels to modern video slots. A dedicated live dealer area provides real-time interaction with professional croupiers. These games are streamed in high definition to provide a clear view of the action.
Advanced search tools allow players to filter through the vast catalogue with ease. Dedicated mobile apps for iOS and Android ensure smooth gameplay while away from a desktop computer. The software is updated frequently to maintain compatibility with modern devices.
- Massive selection of 2,000 games
- Round-the-clock customer assistance
- Dedicated mobile applications available
- Limited variety in niche table games
Duelz Casino Fast Registration
The sign-up process is remarkably efficient, typically taking under 4 minutes to complete. The website features a gamified design that sets it apart from traditional gambling platforms by incorporating competitive elements. Players can engage with others while playing their favourite games.
New users can claim a welcome package worth up to £100 plus 100 free spins on Book of Dead. Regular tournaments and weekly cashback rewards provide ongoing value for consistent players. These incentives are designed to keep the environment engaging for long-term members.
Various payment methods are supported, including debit cards and popular e-wallets for quick transactions. This site stands out among new slot sites by offering a competitive loyalty system for active members. This system rewards players for their time spent on the platform.
- Rapid four-minute account creation
- Weekly cashback for active users
- Unique gamified user interface
- High wagering requirements on bonuses
Sky Casino Security Protocols
Security is a top priority here, utilising industry-standard SSL encryption and two-factor authentication to protect user data. The customer care team provides professional assistance through multiple communication channels including live chat. This focus on safety creates a secure environment for all transactions.
The game collection focuses on quality over quantity, featuring high-end titles from leading developers. A sophisticated live studio offers various versions of blackjack, roulette, and baccarat with high-definition streaming. The 100 free spins offer provides a great starting point for new members.
Mobile performance is optimised for all modern smartphones, ensuring no lag during intensive gaming sessions. The interface remains intuitive, allowing for quick navigation between different gaming categories. Users can access all features of the desktop site directly from their mobile browser.
- Robust SSL and 2FA security
- 100 free spins welcome offer
- High-definition live dealer streams
- Smaller total game count than rivals
Comparing Top Non-GamStop Casino Platforms
Finding the right balance between high limits and player protection is essential when choosing where to play. This table breaks down the current market leaders for UK players looking for alternatives that provide flexibility without compromising on quality or payout reliability.
Casino | New Player Welcome Bonus | Best Features | Rating
|
Coral | Bet £5 Get £20 | Huge Sportsbook, Fast Payouts | 4.5/5 |
Virgin Bet | 100 Free Spins | Daily Free Games, Sports Integration | 4.4/5 |
Casumo | 100% up to £25 | 5,000+ Games, Award Winning | 4.7/5 |
Sky Bet | £30 Free Bet | Integrated Betting, Fast Withdrawals | 4.6/5 |
JeffBet | £30 Bonus | Massive Slot Library, 24/7 Support | 4.3/5 |
Betway | £50 Match | Global Brand, High Limits | 4.8/5 |
Monster | £1000 Package | Mobile Optimized, Large Jackpots | 4.2/5 |
Party | 50 Free Spins | Exclusive Tables, Jackpot Slots | 4.5/5 |
Duelz | £100 + 100 Spins | PvP Battles, Gamified Interface | 4.6/5 |
Sky Casino | £60 Bonus | Live Dealer Focus, Playtech Games | 4.4/5 |
Are Unregulated Slots Sites UK Actually Safe?
Safety remains a primary concern for those moving away from UKGC restrictions. While these platforms operate outside the GamStop scheme, they still adhere to international regulations that protect player funds and ensure fair play through audited software and random number generators. These entities ensure that games are not rigged and that winnings are paid out promptly according to terms.
Verifying Valid Gambling Licences
Legitimate operators usually hold credentials from the MGA, Gibraltar, or Curacao. You can find these details at the bottom of the homepage. Always cross-reference the licence number on the official regulator website to ensure the status is active and valid for the current year. This prevents interaction with clones or fraudulent sites that lack oversight.
Evaluating Available Payment Methods
Secure banking is a hallmark of a reliable site. When searching for new online slot sites, check if they offer recognized methods like Visa, Mastercard, or established crypto wallets. The presence of reputable financial partners indicates that the operator has passed rigorous security checks and maintains high liquidity to handle large jackpot winners.
Assessing Customer Service Responsiveness
Quality support is non-negotiable for a secure gambling environment. Reach out via live chat with a specific question before depositing. A fast, professional response suggests the company invests in its players and values their time. If a site only offers an unattended email address or a broken link, it might be better to look elsewhere.
Reading Authentic User Feedback
Independent forums and community boards provide a clear picture of how a site treats its customers. Look for patterns in feedback regarding withdrawal speeds and bonus transparency. While every site has occasional complaints, a consistent history of successful payouts and positive player interactions is the best indicator of a trustworthy platform for long-term play.
Funding Methods at Independent Slots Sites
Accessing funds quickly and securely remains a top priority for players looking for new slot sites uk. Platforms operating without a UKGC license often provide a broader range of financial tools, including options restricted on local sites. This flexibility allows for smoother transactions while maintaining high security standards across the entire payment landscape for British users who value efficiency and choice when managing their bankrolls. This ensures that every transaction is handled with care.
Method | Deposit Time | Withdrawal Time | Fees
|
Visa Debit Card | Instant Deposit | 1-3 Working Days | No Extra Fees |
Credit Cards | Instant Deposit | 1-3 Working Days | No Extra Fees |
Bitcoin Crypto | 15 Minutes | Under 24 Hours | Network Mining Fee |
Ethereum Crypto | 10 Minutes | Under 24 Hours | Network Mining Fee |
Tether USDT | 10 Minutes | Under 24 Hours | Network Mining Fee |
Litecoin Crypto | 10 Minutes | Under 24 Hours | Low Network Fee |
Skrill E-Wallet | Instant | 0-24 Hours | 1% to 3% Charge |
Neteller E-Wallet | Instant | 0-24 Hours | 1% to 3% Charge |
Paysafecard Voucher | Instant | Not Available | No Extra Fees |
Neosurf Voucher | Instant | Not Available | No Extra Fees |
Trustly Transfer | Instant | 24-48 Hours | No Extra Fees |
SEPA Bank Transfer | 1-2 Days | 3-5 Days | Bank Dependent |
Apple Pay Mobile | Instant | 1-3 Days | No Extra Fees |
Google Pay Mobile | Instant | 1-3 Days | No Extra Fees |
Revolut Card | Instant | 1-3 Days | No Extra Fees |
MiFinity Wallet | Instant | 0-24 Hours | Small Fixed Fee |
Traditional card payments remain popular because of their familiarity and reliability. Unlike UK-regulated platforms, these sites permit credit card usage, offering an extra layer of financial choice for users. Digital wallets like Skrill and Neteller provide a buffer between your bank and the casino, ensuring privacy and rapid processing for both deposits and payouts within the system, which helps players maintain better control over their gaming budgets. This is a major advantage for many people.
Cryptocurrency stands out as the most efficient method for players seeking anonymity and speed. Digital assets bypass traditional banking delays, often resulting in same-day withdrawals. While the casino operators usually avoid charging transaction fees, players should remain aware that blockchain network costs or e-wallet service charges might apply independently of the gaming site during the conversion process, so checking external terms is always a wise move. This ensures you are fully informed before committing.
Security protocols necessitate a verification process before any significant withdrawal occurs. Players must typically provide identification documents and proof of address to comply with international anti-money laundering standards. Completing this step early ensures that future payouts are processed without unnecessary holdups or administrative delays, keeping the flow of funds efficient and transparent for every member who wants to access their winnings without friction or long waiting periods.
Maximising Promotional Incentives and Playthrough Rules
UK casino sites not on GamStop are famous for their massive promotional banners. These offers often exceed what is available on domestic platforms, providing a significant boost to a player’s starting capital.
However, the true value of these incentives often lies buried deep within the fine print, where the devil is truly in the details.
Understanding the variety of rewards is essential for any player looking to maximise their session. Most non-GamStop platforms categorise their promotions through several distinct types, each serving a specific purpose for different styles of gameplay.
- Welcome Packages: Large percentage matches on initial deposits for new arrivals.
- No Deposit Credits: Risk-free funds granted simply for creating a new account.
- Reload Incentives: Ongoing deposit matches provided to existing loyal members.
- Cashback Schemes: Percentage-based refunds on net losses during a week or month.
- Extra Spins: Specific rounds on popular slot titles without deducting from the balance.
Navigating Turnover and Rollover Limits
The most critical factor in any promotion is the wagering multiplier. This figure dictates how many times the bonus funds must be staked before they convert to withdrawable cash. For example, if a player receives a £100 bonus with a 40x requirement, they must place bets totalling £4,000. This mathematical tightrope ensures the house retains its edge.
Game weighting is another hurdle that often catches players off guard. While standard video slots typically contribute the full 100% toward the turnover, table games like baccarat and blackjack might only contribute 10%. This means a £10 bet on blackjack only reduces the requirement by £1.
Operational constraints like maximum stake limits are also standard across these sites. Usually, players are restricted to a £5 maximum bet per spin or hand while a bonus is active. Going over this limit can result in the immediate voiding of the entire bonus and any winnings.
Time is also a factor that players must manage. Most incentives come with a strict expiry date, typically ranging from 7 to 30 days. If the turnover requirements are not met within this window, the remaining bonus funds and any associated profits are removed automatically.
To navigate these complex rules, many successful players utilise wagering calculators. These digital tools allow users to enter the bonus amount and the multiplier. This provides a clear roadmap of the total betting volume needed to successfully clear the funds for withdrawal.
While the percentages offered by non-GamStop casinos are often higher, the difficulty of clearing them remains. Players should always prioritise sites with transparent terms and conditions to ensure their promotional funds actually have a chance of reaching their bank account. This strategic approach prevents frustration and helps maintain a healthy, sustainable relationship with online gaming platforms.
Finding Gaming Options at Independent UK Casino Platforms
Players choosing these platforms find a larger volume of titles compared with standard UK sites. These operators do not follow restrictive technical standards, offering faster gameplay for everyone.
This freedom results in a library exceeding several thousand options for every UK player. You will notice that games load quickly and include all original features without compromise.
Selecting Spinning Reels and Slot Machines
The slot selection is the main attraction. You will find themes ranging from ancient mythology to futuristic adventures. Megaways provide thousands of ways to win on every spin.
Many players prefer these sites because they include the bonus buy feature. This allows direct access to the exciting parts of the game without waiting for natural triggers to occur.
You can find titles such as Gates of Olympus and Book of Dead in their original forms. Other favourites include high-energy games like Le Bandit and the colourful Starlight Princess.
Chasing Progressive and Fixed Jackpot Titles
For those seeking massive payouts, the jackpot section is key. These sites host local and network jackpots that span multiple casinos across the globe for much bigger prizes.
Network progressives like Mega Moolah are famous for multi-million pound totals. The prize pools grow every time someone bets. This creates a high-stakes environment players find appealing for sessions.
Playing Classic Table Gaming Selections
Traditional fans are well-catered for with digital table games. Roulette remains a staple, with European, American, and French versions available for different tactical approaches and various betting limits.
Blackjack enthusiasts can test their skills in various formats. Baccarat and poker variations, such as Caribbean Stud or Three Card Poker, are standard. These games use certified generators to ensure fairness.
Joining Real-Time Dealer Interactions
For a social atmosphere, the live section brings the casino floor to your screen. High-definition cameras stream professional dealers to your device. You can interact with staff while placing bets.
Beyond standard tables, game shows are a hit. Titles like Crazy Time offer a theatrical environment with bonus rounds. It combines television show thrills with casino mechanics for unique gameplay.
Grasping Payout Rates and Risk Levels
Understanding the Return to Player percentage is vital. This figure represents the theoretical amount a game pays back. For example, a 96% RTP means for every £100 wagered, the machine returns £96.
Volatility is another factor. Low volatility games pay small amounts frequently, while high volatility titles pay larger sums. Knowing these stats helps you manage bankrolls effectively while playing your favourite games.
Identifying Leading Software Development Studios
The quality of a library depends on the developers. These platforms partner with the biggest names to ensure quality. You will find software from Pragmatic Play, NetEnt, and Evolution Gaming.
Other contributors include Play’n GO, Hacksaw Gaming, and Nolimit City. For those who enjoy innovative themes, Push Gaming and Relax Gaming also provide many popular titles for everyone in 2026.
Identity Checks and Payout Procedures Explained
KYC Category | Verification Requirement |
Identity Verification | National ID card, valid Passport, or full driving licence |
Address Confirmation | Utility bill or bank statement issued within the last 3 months |
Payment Method Proof | Photos of debit card (front/back with sensitive digits hidden) or e-wallet screenshots |
Internal Processing | Finance team approval typically takes 12 to 48 hours |
Standard Payout Speed | Cryptocurrency: Instant; E-wallets: 24h; Cards: 3-5 business days |
Enhanced Due Diligence | Source of funds checks for high-value transactions or unusual patterns |
Completing the Know Your Customer process is vital for hassle-free transactions at these independent casino platforms. While these sites operate outside the UKGC network, they maintain strict security protocols to prevent fraud and money laundering. Players must submit a clear image of their Passport or identity card to confirm their legal age and legal status before withdrawing funds. Providing high-quality scans ensures that the administrative team can verify your account details without requesting further documentation or causing unnecessary friction.
Proof of residency requires a utility bill or official document dated within the last 90 days. For financial security, you must provide card photos showing the first and last four digits only. Ensuring all documents are high-resolution and fully visible will significantly reduce wait times during the initial withdrawal request. Once verified, subsequent payouts usually proceed much faster without repetitive checks or unnecessary delays for the user. Most operators aim to finalise these checks quickly to maintain a positive reputation among international players seeking reliable services and fast access to their winnings.
Responsible Play and Account Control Options
Since GamStop does not cover these international casino sites, players must take a proactive approach to managing their habits. These platforms provide internal mechanisms to help maintain a healthy balance between entertainment and risk. Using these features allows for a safer environment without the rigid restrictions often found on domestic networks, giving players more control over their personal gaming habits and financial boundaries.
- Daily, weekly, or monthly deposit limits to manage spending
- Reality checks and session reminders to track time spent playing
- Temporary account freezes for short-term breaks from gambling
- Permanent self-exclusion directly through the site settings or support
If you feel your gambling is becoming problematic, several professional organisations offer free assistance and advice. You can reach out to BeGambleAware at begambleaware.org or contact GamCare at gamcare.org.uk for confidential help. Additionally, Gambling Therapy provides international support through their website at gamblingtherapy.org for those needing immediate intervention or emotional guidance while playing at any online casino site outside the local scheme. Ensuring you use these resources helps maintain a balanced approach to gaming and overall well-being.
Common Questions Answered
Can British residents join sites without GamStop?
Yes, UK players can register at these platforms. They operate under international licenses, allowing access to those seeking alternatives to the national self-exclusion scheme while maintaining their personal choice.
Are payouts secure on these platforms?
Security remains a priority for reputable international operators. They utilize advanced encryption technology to protect financial transactions, ensuring that your winnings reach your chosen payment method safely and efficiently.
Which safety features exist for players?
While not part of the UK scheme, these sites provide internal self-exclusion options. Users can request account closures or set cooling-off periods directly through the customer support team whenever necessary.
How do these differ from UKGC sites?
The primary difference lies in regulation and restrictions. These platforms often permit credit card usage and provide larger bonuses, as they are not bound by specific UKGC technical safety standards.
Are credit card deposits allowed here?
Many international platforms accept major credit cards for both deposits and withdrawals. This offers a level of flexibility that is currently unavailable at casinos licensed directly within the United Kingdom.
What types of games are available?
Players can access a vast selection of slots, live dealer tables, and traditional card games. These sites partner with global software developers to provide diverse and high quality gaming options.
Is mobile play supported on these sites?
Most modern platforms are fully optimized for mobile browsers. You can access your favorite games on smartphones or tablets without needing to download any specific software or additional applications.
How long do withdrawals typically take?
Processing times vary depending on the chosen method. E-wallets and cryptocurrencies often provide the fastest results, while traditional bank transfers or card withdrawals might take a few business days.
Can I set personal deposit limits?
Most reputable sites allow users to establish daily, weekly, or monthly deposit caps. This helps maintain control over spending and encourages a balanced approach to online gaming activities today.
Are bonuses larger than UK licensed sites?
International operators often provide more substantial welcome packages and ongoing promotions. Because they face different tax structures and regulatory costs, they can pass these benefits to the active players.
Do these casinos require identity verification?
Verification is standard practice to prevent fraud and underage gambling. You will usually need to provide identification documents before your first withdrawal is approved by the site finance department.
Is customer support available 24/7?
Reliable platforms typically offer round-the-clock assistance via live chat or email. This ensures that any technical issues or account queries are addressed promptly regardless of the current time.
Are these sites legal for UK residents?
It is not illegal for individuals in the UK to play at offshore sites. These operators simply do not hold a UKGC license, choosing instead to be regulated elsewhere instead.