Home » Casino Sites » Non-UKGC Licensed Casinos: Licences and Risks

Non-UKGC Licensed Casinos: Licences and Risks

Updated October 2026
Licensed
gbAvailable in GB
Fast payouts
18+ Only

A guide to offshore licensing, Great Britain access, GamStop differences, payment routes and checks on operator details.

What “Non-UKGC” Means—and Which Licences You May See

A non-UKGC casino is an online gambling site that operates outside the oversight of the UK Gambling Commission. The label describes the regulator the site is not overseen by; it does not, by itself, tell you whether the operator holds a licence from another jurisdiction.

That distinction matters when you see terms such as “licensed casino” or “international licence” on a site. A licence issued elsewhere is not a UK Gambling Commission licence. So a casino may describe itself as licensed while still being a non-UKGC casino. The two statements refer to different regulators, not competing descriptions of the same authorisation.

The UK Gambling Commission, often shortened to UKGC, is the regulator associated with UKGC-licensed online casinos. When people refer to a UKGC-licensed casino, they mean a casino operating under that regulator’s oversight. A site licensed by a different jurisdiction belongs to a different regulatory category, even if it offers familiar casino games or presents its licence details prominently.

Which other licensing names may appear?

Non-UK-regulated casinos may be associated with jurisdictions including Malta, Curaçao, Gibraltar and Anjouan. You may see one of these names in a site’s footer, terms or other licensing information. The name indicates the jurisdiction connected with the stated licence; it does not make that licence a UKGC authorisation.

Gibraltar Casino Licence and UK Gambling Rules

This is why “non-UKGC” should not be read as meaning “necessarily unlicensed”. Some casinos outside UKGC oversight hold licences issued elsewhere. Others may use broad wording that leaves the licensing position unclear. The label alone cannot settle which applies to an individual site, and a list of foreign licensing jurisdictions is not a list of UKGC-licensed casinos.

It also helps to keep “UK-based” separate from “UKGC-licensed”. A company’s location and the regulator named in connection with its casino are not interchangeable details. For the purposes of this distinction, the key question is whether the site is under UK Gambling Commission oversight—not simply where the operator is based or which countries it mentions.

Reading the terminology

You may encounter several versions of the same basic phrase: non-UKGC casino, non-UKGC-licensed casino or casino not licensed by the UKGC. In ordinary use, these point to a site outside the Commission’s oversight. “Non-UK-regulated casino” is another way to describe that category, although it should not be taken to mean that the site has no regulatory connection anywhere.

By contrast, “UKGC-licensed casino” refers specifically to oversight by the UK Gambling Commission. The wording is not a quality rating, a description of the games or a guarantee about every aspect of an operator. It identifies the regulator involved. Keeping that meaning narrow makes it easier to compare descriptions without assuming that two different licences provide the same oversight.

Searches for which online casinos are licensed by the UKGC can also blur these categories. A casino may mention a licence from Malta, Curaçao, Gibraltar or Anjouan, but that does not place it among UKGC-licensed online casinos. The regulator’s name is the essential distinction: a licence from another jurisdiction remains a different licence.

Curaçao Casino Licence in the UK: What It Means

When you read “non-UKGC casinos UK”, the phrase may refer to casinos outside UKGC oversight that are being discussed in a UK context. It does not change what the term means. Nor does the year in a page title change the underlying distinction: “non-UKGC licensed casinos 2026” still describes casinos that are not overseen by the UK Gambling Commission, regardless of whether a different jurisdiction is named.

For now, keep the categories separate: UKGC-licensed casinos are under the UK Gambling Commission’s oversight; non-UKGC casinos operate without that oversight and may instead name another licensing jurisdiction. A licence label tells you which category a site says it belongs to. It should not be treated as interchangeable with a different regulator’s licence.

Top online casinos in the UK

  1. SlotoSport
    Bonus: 500% up to £ 10 200+ 777 FS · Payout speed: 1-3 business days
  2. Britsino
    Bonus: Welcome Package – Get your £2,200 + 2,000 FS · Payout speed: 1-3 business days
  3. Jetsetspins
    Bonus: 200% Bonus + 100 Free Spins + Free Royal Wheel · Payout speed: 1-3 business days
  4. BeOnBet
    Bonus: 100% up to €500 + 100 FS · Payout speed: 1-3 business days
  5. Dieselwin
    Bonus: Welcome Pack 250% up to £4000 + 200 FS · Payout speed: 1-3 business days
  6. Amunbet
    Bonus: Join now and get 450% up to 2,700 GBP + 450 FS · Payout speed: 1-3 business days
  7. SpinFormula
    Bonus: 550% Up To £15,000 + 550 FS · Payout speed: 1-3 business days
  8. Revery Play
    Bonus: 100% up to€1,000+ 100 FS · Payout speed: 1-3 business days
  9. x3bet
    Bonus: Welcome Pack 100% Up to £1.000 + 200 Free Spins · Payout speed: 1-3 business days
  10. Zombillion
    Bonus: Welcome Pack 250% up to £4000 + 200 FS · Payout speed: 1-3 business days

How Offshore Casino Licensing Works in Practice

An offshore licence is not a general assurance that every part of a casino’s operation has been independently checked. What it means depends on the rules of the issuing jurisdiction and the duties those rules place on the operator. An Anjouan casino licence, for instance, should be understood in light of what Anjouan’s framework actually requires—not as equivalent to oversight by the UK Gambling Commission or another regulator.

An offshore licence is not a general assurance that every part of a casino’s operation has been independently checked. Its meaning depends on the rules and duties of the specific issuing jurisdiction.

That distinction matters when you compare casino sites without a UKGC licence. A licence may show that an operator has a relationship with a foreign licensing authority, but it does not, by itself, establish that games have been independently tested, that player funds are protected, or that a regulator will intervene if you and the operator disagree. Those protections depend on the framework and the operator’s compliance with it.

What the Anjouan framework requires—and leaves open

Anjouan’s framework does not require operators to use independently tested random number generators, undergo audits, or keep player funds segregated. That does not prove that a particular casino’s games are unfair or that its accounts are unreliable. It does mean that you should not assume these protections exist simply because the site displays an Anjouan licence.

A casino may make claims about its games, security or financial practices. The licence alone cannot confirm those claims where the framework does not require the relevant checks. Look for evidence of what the operator says it does, and consider whether that evidence comes from an independent body or from the operator itself. A statement on a casino’s own pages is not the same thing as an audit requirement imposed by a regulator.

This is one practical limit of casino sites outside the UKGC: a foreign licence and a UKGC licence are not interchangeable labels. The useful question is not just whether a site says it is licensed, but what the licensing system expects the operator to do and what recourse it offers when a complaint is not resolved.

Casino Selection: UK Casino Options and Filters

A response deadline is not an appeal route

Under Anjouan’s framework, an operator must respond to a complaint within 30 calendar days. That is a duty to reply; it should not be mistaken for a guarantee that the operator will agree with you, put matters right, or provide a decision from an independent reviewer.

The Anjouan authority does not handle, mediate or adjudicate player complaints. If the operator’s response does not resolve the issue, the framework does not provide a regulator-led route for the authority to decide the dispute. Anjouan-licensed casinos also do not offer an independent dispute-resolution route comparable to services approved by the UKGC.

Before depositing, read the casino’s complaint procedure and note how it asks you to submit a concern, what information it requires, and how it says it will respond. Keep copies of relevant messages and account records. These steps can help you explain a dispute clearly, but they do not create an independent appeal process where one is not available.

Read the licence claim as a limited assurance

For offshore non-UKGC casino sites, the licence should be treated as one piece of information about the operator—not a shortcut for judging the whole service. A displayed badge does not tell you whether the operator follows its stated complaint process, and a response deadline does not mean an outside authority will enforce a satisfactory outcome for you.

Summary

Before using an offshore site, distinguish between what a licence covers, what an operator must do, and who can provide recourse if duties are not met.

If you are considering a site, separate three questions: what the licence covers, what the operator is required to do, and who can act if the operator does not meet those duties. For Anjouan, the complaint-handling limits are especially important: the operator has a response obligation, but the authority does not decide the player’s complaint. Knowing that difference before a problem occurs gives you a clearer picture of what the licence does—and what it cannot promise.

Are Non-UKGC Casinos Legal for Players in Great Britain?

The legal position depends on whether you are looking at the operator or the person using the site. Under the Gambling Act 2005, the main requirement falls on businesses that provide gambling to customers in Great Britain: they must hold the relevant licence from the UK Gambling Commission. An operator’s base abroad does not remove that requirement if it is supplying the British market.

That means an online casino not regulated by UKGC is not authorised to serve customers in Great Britain under the UK licensing system. A licence issued elsewhere does not replace a UKGC licence for this purpose. The distinction matters: a site may describe itself as licensed overseas, but that does not make its service a UKGC-regulated online casino.

The position of an individual player is different. British law does not make it a criminal offence for a player to gamble on a site without a UKGC licence. Nor does the law expressly ban British citizens from using gambling services that are licensed in another country. Those points concern personal liability; they do not give an overseas operator permission to offer gambling to people in Great Britain without the required local authorisation.

Non-UK Licence Casinos: Rules, Payments and Protection

So, if you are considering an online casino outside UKGC oversight, do not treat the absence of a criminal penalty for players as proof that the service is legally approved for the British market. The operator’s obligations and your own position are separate questions. A foreign licence may relate to the operator’s activities in the jurisdiction that issued it, but it does not change the UK rules that apply when a business supplies gambling to customers in Great Britain.

You should also check the law that applies where you live before using an offshore service. The Gambling Act 2005 covers England, Wales and Scotland, but not Northern Ireland, so the legal framework is not identical across every part of the UK. If you are outside Great Britain, or your circumstances involve another jurisdiction, do not assume that the position described for British players applies to you. Local laws can differ, and it is your responsibility to understand the implications before you decide whether to use the service.

This is not the same as choosing between a UKGC online casino and a site that happens to be accessible from Britain. Accessibility does not establish that an operator is authorised to serve the market, and an overseas licence does not confer UK approval. At the same time, the absence of UKGC authorisation should not be confused with a rule that automatically makes the player a criminal.

The practical distinction is therefore straightforward: operators supplying gambling into Great Britain are required to hold a UKGC licence, while players are not criminally prosecuted under UK law simply for using an unlicensed site. That does not remove the need to check local laws or consider what it means to use a service outside the UK regulatory system.

DO

  • Check the local laws where you live
  • Verify the operator’s authorisation for the British market
  • Distinguish between accessibility and legal approval

DON’T

  • Assume an overseas licence replaces a UKGC licence
  • Treat the absence of criminal penalties for players as proof of legal approval
  • Assume the legal framework is identical across all parts of the UK

What Changes When a Casino Is Outside GamStop?

GamStop is the UK Gambling Commission’s self-exclusion scheme. Casinos that are not part of it do not fall within that scheme. If you have registered with GamStop, do not assume that the registration will block you from accessing a casino outside it. The name or appearance of a site does not change that boundary.

This can be confusing when a site describes itself as a “UKGC casino without GamStop” or a UKGC casino outside GamStop. Those phrases do not establish that a casino is part of the UKGC system. A casino outside GamStop is, by definition, not covered by the scheme; the phrase “UKGC casino not affected by GamStop” can therefore blur two different things. Check what the site actually says about its participation rather than relying on shorthand in an advert or review.

The practical point is narrow but important: GamStop’s exclusion does not extend to casinos that are not part of the scheme. A UKGC casino not registered with GamStop is not a reliable description of a site’s status; it may simply be wording used to attract attention. Treat claims such as “not blocked by GamStop” as a signal to establish whether the operator participates, not as proof that the site is suitable or that access will be prevented.

If you have chosen self-exclusion because gambling is causing harm, a gap in coverage can matter at a moment when you may be looking for a way around your own decision. Do not test whether a casino outside GamStop will let you register or play. The fact that a site is accessible does not mean your GamStop registration applies there, and seeing it in search results does not mean it has been checked against your exclusion.

Non-GamStop Curaçao Casino Sites: What to Know

A more useful response is to make the boundary part of your plan before you encounter a tempting offer. Keep in mind that GamStop covers participating sites, not every gambling website you might find. If you are unsure whether a particular casino belongs to the scheme, do not infer its status from a banner, a review headline, or wording such as “UKGC casinos not part of GamStop”. Verify the claim through the operator’s information and GamStop’s own service before acting; if you cannot establish that the site is covered, assume your exclusion may not stop access.

It may also help to avoid treating a search for an “UKGC casino not blocked by GamStop” as a technical question only. The central issue is whether the site is inside the exclusion scheme, not whether a device or account happens to allow a page to load. A UKGC casino not under GamStop is not a safe assumption to make from a label. Likewise, a site saying it is “not signed up” does not make your GamStop registration broader than it is.

Keep the distinction clear: GamStop is a self-exclusion scheme, and casinos outside it are not part of it. Do not rely on GamStop to block access to those casinos. If you are trying to maintain an exclusion, avoid using a site whose participation you cannot confirm.

GamStop Gap

GamStop’s exclusion does not extend to casinos that are not part of the scheme. Do not assume your registration will block access to sites outside the network.

What Non-UKGC Casinos May Offer—and What You Give Up

A non-UKGC casino may set fewer restrictions on deposits and withdrawals than a UKGC-licensed operator. That can mean more flexibility in how you manage funds and, in some cases, faster payouts. But a less restrictive policy is not automatically a better one: it may come with fewer safeguards if something goes wrong.

The difference is not simply a matter of convenience. UKGC-licensed operators must provide mandatory responsible-gambling tools, while a non-UK-regulated casino may not be held to the same standards. You could have less support for managing how much you spend or how long you play. Before depositing, check what controls the site actually offers and whether they can be adjusted or used when you need them.

You also give up access to UK routes for redress. If a dispute arises, you cannot take it to the UK’s Financial Ombudsman Service on the basis that the casino is outside UK regulation. That matters if you and the operator disagree about a payment, account decision or application of the terms: a more flexible offer does not give you the same independent protections.

Data protection is another part of the trade-off. A non-UK-regulated casino may follow less stringent requirements than a UKGC-licensed operator. Consider what personal and payment information the site requests, how its privacy terms explain the use of that information, and whether you are comfortable sharing it. Do not assume that the protections familiar from a UK-licensed service apply in the same way.

Bonuses or fewer account restrictions can make a site look attractive, but the headline offer is only one part of the decision. Read the terms alongside the rules for deposits, withdrawals and responsible-gambling controls. If important conditions are unclear, you cannot treat apparent flexibility as a substitute for protection.

Searches for a “safe” or “legitimate” non-UKGC casino do not remove these differences. A site may operate under a licence from another jurisdiction, but that does not provide UKGC oversight or restore UK complaint routes and mandatory tools. Weigh any practical flexibility against the protections you would no longer have before deciding whether to use the service.

Payments and Withdrawals: Check the Route Both Ways

A deposit method is only half the payment route. Before sending money to a non-UKGC-regulated casino, check whether the same method can be used for withdrawals. A site may accept a card, e-wallet, bank transfer or cryptocurrency through an alternative payment processor, but that does not mean it will return winnings through the same channel. The operator’s cashier and terms should explain which withdrawal methods are available and whether you must use a particular one.

That distinction matters if a payment is converted between currencies, routed through an intermediary or sent to an account in a different name. Read the relevant conditions before depositing, and keep records of the method used, transaction details and any messages from the operator. Do not assume that a successful deposit proves a withdrawal will be straightforward.

Withdrawal Methods

Check if the same method used for deposits can be used for withdrawals. A site may accept certain funds through a processor but use different channels for returning winnings.

Published descriptions of withdrawal times conflict. Some say payments can arrive within 24 hours to 5 business days, depending on the method; others report waits of three or four weeks. Treat neither estimate as a promise for your account. Processing may involve checks by both the casino and payment provider, and there is no UKGC regulatory clock to enforce a payout deadline at a non-UKGC operator.

Limits can also affect how quickly you receive a larger balance. A specialist review has reported that some casinos set daily, weekly or monthly withdrawal caps, meaning a win may have to be paid in instalments. These terms can vary by operator and may change, so look for the current limits and any rules about multiple pending withdrawals rather than relying on a general description of a site.

Verification is another possible delay. Identity and payment checks can be part of a withdrawal, but a players’ forum has also described operators asking for notarised documents or a video call. Such reports are not proof that every operator will make these demands; they are a reason to check what documentation the casino reserves the right to request before you deposit. If requirements appear only when you ask to withdraw, resolving the issue may take time.

Keep copies of the cashier terms and withdrawal conditions as they stood when you opened the account. If a payment is delayed, ask the operator in writing what is outstanding and what action is needed. Avoid sending extra money simply to unlock a withdrawal unless the terms clearly explain the requirement and you are comfortable with it. The practical question is not only how easily funds go in, but whether the route back is clear, affordable and documented.

Why “Best” Is Not a Safe Shortcut for Choosing a Site

A “best” label can make a casino sound as though it has passed a consistent safety test. It may instead reflect a publisher’s own criteria, a commercial relationship, or a short-term offer. Unless the ranking explains how sites were assessed and how it is funded, the position on the page tells you little about the operator’s reliability.

The same caution applies to claims that a site is trusted, new or among the top choices for UK players. A new casino may have limited public history for you to assess; an established name is not, by itself, proof that its terms are fair or that you can resolve a dispute. And a ranking aimed at people in Britain does not mean a casino is authorised to serve them. For instance, an Anjouan casino licence does not permit operation in the United Kingdom.

Treat “best non-UKGC casino” as a marketing description, not a recognised status. A site may be described as international or offshore, but those words do not tell you which company would hold your account, what rules apply to it, or what would happen if the operator failed. Under Anjouan’s framework, player funds are not guaranteed to be kept separate from company funds. If the operator becomes insolvent, you would be an unsecured creditor, not someone whose balance is assured.

Before giving weight to a review, look at what it actually evaluates. Does it explain how the operator’s company and licence relate to each other? Does it discuss restrictions and the consequences of disputed terms, or focus mainly on games and promotions? Does it clearly distinguish an operator’s own claims from independent evidence? If the page offers praise without explaining its basis, that is not a reason to trust the casino.

Evaluating Rankings

  • Check if the ranking explains how sites were assessed
  • Identify if the ranking is based on commercial relationships
  • Determine if the review distinguishes between operator claims and independent evidence

Be particularly wary of a ranking that treats bonuses, payment choice or a polished website as evidence of safety. These features do not establish who is responsible for the service or whether you will have meaningful recourse if something goes wrong. A “best UKGC casino” list and a list of non-UKGC sites are not interchangeable: the label matters, and a UK-focused ranking cannot turn a foreign licence into UK authorisation.

You do not need to accept a ranking’s shortlist. Use it, at most, to identify names for further scrutiny, then make your own decision about whether the operator’s status and terms are acceptable. If those points remain unclear, a confident headline is no substitute for clarity.

How to Check a Casino Licence and Operator Details

A licence badge on a casino’s website is only a claim. To check it, identify the regulator named there, then look for the operator in that regulator’s public register. Do not rely on a logo, a certificate image or a link that returns you to the casino’s own pages.

Compare the register entry with the details in the site’s terms and conditions. The company name should match, not merely resemble the casino’s brand. Check that the licence is current and note its expiry date; if the register does not show a clear, valid entry, treat the claim as unverified. A mismatch between the operator named in the terms and the company listed by the regulator also needs an explanation before you proceed.

If a casino says it holds a UK Gambling Commission licence, use the Commission’s public register to check the operator and licence details. This is the relevant UKGC casino licence checker for confirming whether a company appears on the register. A site serving customers in Great Britain needs a UK Gambling Commission licence, wherever the operator is based. A foreign licence does not replace it.

For online casino sites outside the UKGC system, check the named overseas regulator’s own register in the same way: search for the company, compare the licence details with the casino’s terms, and check the expiry date. If you cannot find a matching entry, or the information conflicts, do not assume the licence is genuine or applies to that site.

Pay particular attention to what the licence permits. An Anjouan casino licence does not authorise operation in the United Kingdom or other markets listed as restricted. A valid entry on an overseas register is not evidence that the operator is allowed to serve customers in Great Britain. Check the operator’s stated market restrictions as well as the register, and do not treat a general licence as permission to accept UK customers.

Keep a record of the company name and register entry you checked. If the casino later changes its terms or displays different operator details, compare them again rather than assuming the original check still applies. A licence check can confirm what a regulator’s register says; it cannot by itself establish that every claim on the casino’s website is accurate.

Checking a Licence

Step 1: Identify the regulator

Find the name of the regulatory body mentioned on the casino’s licence badge or site.

Step 2: Search the public register

Locate the official public register for that specific regulator and search for the operator’s company name.

Step 3: Compare details

Verify that the company name, licence number, and expiry date on the register match the details provided by the casino.

What GamStop Does Not Cover—and What Safeguards May Be Missing

GamStop is the UK’s self-exclusion scheme, but its reach is not universal. Casinos operating outside the UK Gambling Commission’s system are not automatically included, so registering with GamStop should not be treated as a way to block every gambling site you might encounter. In particular, an Anjouan-licensed casino is not required to integrate with the scheme.

That distinction matters if you are trying to avoid access during a self-exclusion period. A site may be described as outside GamStop, but that does not make it a safe alternative or provide an equivalent way to restrict your own play. Do not assume that a self-exclusion request made through one service will be shared with an operator outside its coverage.

The wider concern is what protections are available on the site itself. Non-UK-regulated casinos may not offer the same responsible-gambling measures as UKGC-licensed operators. Tools such as deposit limits or account self-exclusion may be absent, harder to find, or governed by different terms. Check the operator’s rules before registering, and consider whether the tools are practical for you to use—not merely mentioned in promotional material.

If you need a firm barrier to gambling, relying on an offshore operator’s own controls may leave a gap. A site’s voluntary tool is not the same as inclusion in GamStop, and you should not assume that a request will be applied across other operators. If you have already self-excluded, avoid treating a casino free of UKGC self-exclusion as a workaround.

There can also be a gap when something goes wrong. An Anjouan-licensed casino is not required to provide an independent dispute-resolution process comparable to the services approved for UKGC operators. This means you may have no equivalent independent route to ask a third party to review a disagreement with the casino. The licensing framework does not itself supply that missing service.

Before creating an account, look for clear, usable information about limits, time-outs and self-exclusion, and check what the operator says happens when you request them. If the controls are unclear or the complaint route is not independent, take that as a meaningful limitation—not a detail to resolve after a problem starts.

Before You Use a Casino That Is Not UKGC-Licensed

Before opening an account, pause over what you would do if the operator changed its terms, restricted your account or refused to resolve a dispute. At a non-UKGC casino, you cannot take a complaint to the UK Gambling Commission, and you do not have access to the UK’s Financial Ombudsman Service. A policy page or customer-support promise is not a substitute for those routes.

Read the terms that apply to your account, including rules for withdrawals, account closure and verification. Save a copy of the terms and any important messages before depositing. If the operator’s wording is unclear, or you cannot find a way to contact it, treat that as a reason to stop rather than assume the issue will be settled later. Delays, frozen accounts and demanding verification checks are risks to consider.

Check what safer-gambling controls are actually available before you register. Playing outside the UKGC system means giving up mandatory UK responsible-gambling tools. Do not assume you will be able to set the same limits or use the same protections you may rely on elsewhere.

Age must be checked before an operator lets you deposit. Do not proceed if the site appears willing to accept money before completing that check, or if its process for confirming your age and identity is unclear.

Finally, consider whether you can accept the consequences if a disagreement remains unresolved. You are responsible for checking the laws that apply to you and understanding the implications of using an offshore gambling service. If you would not be comfortable relying only on the operator to address a problem, do not deposit.

What payment methods work best at non-UK-regulated casino sites?

You may find credit cards, e-wallets, bank transfers and cryptocurrencies, often processed through alternative providers. Some sites also accept payments charged to a mobile phone bill or deducted from a prepaid balance; withdrawals can take from 24 hours to five business days, or as long as three or four weeks.

Are non-UK-regulated casinos legal for UK players to use?

You do not commit a criminal offence under UK law by gambling on a site without a UKGC licence, and UK law does not explicitly prohibit British citizens from using gambling services licensed elsewhere. However, operators serving customers in Great Britain must hold a UKGC licence.

What is the biggest risk of playing at a non-UK-regulated casino?

You may have limited ways to recover money or resolve a dispute: Anjouan’s authority does not adjudicate player complaints, and Anjouan-licensed casinos do not guarantee that player funds are kept separate. If the operator fails, you may be an unsecured creditor.

Can I complain to the Anjouan regulator if a casino won’t pay me?

No. The Anjouan authority does not handle or adjudicate player complaints, and Anjouan-licensed casinos do not offer an independent dispute-resolution route comparable to UKGC-approved services.

Are sites that are not on GamStop legal for players in the UK to access?

You do not commit a criminal offence under UK law by gambling on an unlicensed site. But operators serving customers in Great Britain must have a UKGC licence, and casinos outside that system are not part of GamStop.

Is it legal for a UK player to gamble at an Anjouan-licensed casino?

You do not commit a criminal offence under UK law by gambling on an unlicensed site, and UK law does not explicitly prohibit British citizens from using gambling services licensed abroad. An Anjouan licence does not authorise the operator to serve the UK market; operators serving Great Britain require a UKGC licence.

Responsible Gambling