Online Casino with 400% Bonus 2026: The Real Terms Behind Huge Match Offers

Online Casino with 400% Bonus 2026: The Real Terms Behind Huge Match Offers

Most casino adverts run on the same tired promise: deposit £100, get £400. The maths looks stunning until you read clause 9.4. This guide breaks down how 400% deposit bonuses actually work in 2026, why UK-licensed casinos cannot legally offer them, and which offshore brands still advertise them. You will find a comparison table, wagering calculations, and tougher questions to ask before you click “claim”.

Four hundred per cent sounds like a typo. It is not. These promotions do exist, mostly outside the UK Gambling Commission’s reach. The catch hides in wagering requirements, game weightings, and cashout caps. If you are searching for “online casino with 400% bonus 2026”, you are probably seeing results for crypto casinos, Curacao-licensed operators, or sites that do not accept UK players. That is the first thing to understand.

This page is not a sign-up guide. It is a cost-benefit analysis. The casino industry loves a big number because it works on human optimism. You deposit £50, see £250 in your balance, and feel like you have already won. That feeling is the product. The terms and conditions are the invoice.

What a 400% Casino Bonus Actually Means

A 400% deposit bonus multiplies your qualifying deposit by four. Deposit £20 and the casino adds £80 in bonus funds, giving you £100 to play with. Deposit £100 and you get £400 on top, total £500. The headline percentage tells you nothing about how much of that total you can ever withdraw. The real value sits in the terms: wagering multiplier, game contribution percentages, maximum cashout, and time limits.

These offers usually appear as first deposit welcome bonuses on offshore crypto platforms. Some split the 400% across multiple deposits—say 150% on first deposit, 125% on second, 125% on third. Others attach free spins to the match. A 400% bonus with no wagering would be an instant loss for the casino. That is why every legitimate operator wraps it in conditions that make an immediate withdrawal impossible.

Why would any casino advertise such a high match? Customer acquisition. A new player costs money, and a big bonus headline pulls in registrations faster than a modest 100% match. The operator knows that many players will never complete wagering, so the bonus liability never materialises. That is the business model. You are not the exception.

Consider the player who deposits £25, receives £100 bonus, and then never reads the terms. They play a few spins, lose, and move on. The casino paid nothing extra because the bonus was cleared by wagering or voided. The 400% banner cost the casino only the affiliate commission. That is how these offers remain profitable.

How does a 400% casino bonus work?

You make a qualifying deposit, usually £10 to £50. The casino adds four times that amount in bonus funds to your account. You cannot withdraw the bonus immediately. You must wager the bonus amount—and often the deposit as well—a set number of times on eligible games. Only after completing those requirements does any remaining bonus balance convert to real cash.

The UK Reality: Why UKGC Casinos Cannot Offer 400% Bonuses

UK-licensed casinos operate under the Gambling Commission’s bonus rules. Since the 2018 regulatory review, those rules require promotions to be fair, transparent, and not misleading. A 400% match with a 40x bonus-plus-deposit wagering requirement would almost certainly fail the fairness test. The Commission also expects operators to avoid encouraging excessive play. A headline that quadruples your deposit does exactly that. So you will not find a UKGC-licensed brand running a 400% welcome offer in 2026.

Some UK casinos offer 100% matches or smaller deposit bonuses with free spins. Their terms are clearer, and they must honour self-exclusion tools like GAMSTOP. The trade-off is a lower headline. But lower headline often means lower hidden cost. A 100% bonus with 35x wagering on bonus only can be cheaper to clear than a 400% bonus with 40x wagering on deposit plus bonus. We will run that calculation later.

If you see “400% casino bonus UK” in search results, look at the operator’s footer. If the licence is from Curacao, Anjouan, or Costa Rica, it is not UK-regulated. That does not automatically make it a scam, but it does mean you lose UK consumer protections: no ADR scheme, no formal complaints process, and no requirement to verify your identity under UK anti-money laundering standards. The UK Gambling Commission does not license overseas sites that accept UK players without approval.

The UKGC also banned the use of credit cards for gambling in 2020. Offshore sites may still accept credit card deposits through third-party processors, but those transactions often appear as non-gambling purchases and can trigger chargebacks or fraud flags. That is another layer of risk. Your bank may freeze your account for using a gambling site that is not on the UK whitelist.

Is a 400% casino bonus legal in the UK?

UK-licensed casinos are not prohibited from offering high percentages by a specific law, but the Gambling Commission’s fairness and responsible gambling rules make 400% bonuses commercially unviable. Operators must not mislead players or encourage harmful play. A 400% match with opaque terms would breach those standards. In practice, no UKGC casino runs such an offer in 2026. Offshore sites advertising 400% bonuses are not licensed for UK players.

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Where 400% Bonuses Still Exist in 2026

Offshore and crypto-first casinos dominate this niche. Brands like Stake, BC.Game, Cloudbet, BitStarz, mBit, and 7Bit have all used high-percentage welcome bonuses at some point. Their licences typically come from Curacao or other offshore regulators. They market to international players, often excluding the UK by IP or payment method. In 2026, many of these sites no longer accept new UK customers because of increased regulatory pressure. Some still do, but you will bypass UK protections if you play there.

The operators that advertise 400% bonuses tend to favour cryptocurrency deposits. Bitcoin, Ethereum, Litecoin, and Tether allow fast transfers with low fees. That suits a bonus with a short time limit—you need to deposit and start wagering quickly. Card payments may be blocked or incur fees. Some also accept e-wallets like Skrill or Neteller, but the best terms often apply only to crypto.

Do not confuse “advertised” with “available”. A casino may show a 400% banner on an affiliate site but have changed the offer by the time you land on the registration page. Always check the promotions page and the full terms and conditions before depositing. The table below lists recognisable brands that have promoted 400% bonuses, but the column “Bonus Type” is based on public affiliate pages and may have changed. Verify before you commit money.

The geographic pattern is telling. Search from a UK IP and many of these sites display a “not available in your country” message. Search from a country without strict gambling regulation and the 400% banner appears. That is not server error; that is compliance software doing its job. If you use a VPN to bypass it, you violate the site’s terms and risk losing your deposit.

Comparison Table: Recognisable Brands Advertising 400% Bonuses in 2026

This table includes offshore operators that have recently marketed 400% deposit bonuses. None of these hold a UKGC licence. UK players should treat the table as research, not a recommendation. Exact bonus amounts and wagering multipliers change frequently, so the table lists bonus type and typical terms only.

Casino Licence Bonus Type Typical Wagering Payment Methods Notes
Stake Curacao 400% first deposit bonus 40x bonus + deposit Crypto only No UKGC licence; blocks UK IPs in many cases
BC.Game Curacao 400% welcome bonus High, varies by game Crypto, some e-wallets Aggressive VIP programme; terms change often
Cloudbet Curacao 400% deposit match 40x bonus Crypto Sportsbook and casino; no UK players
BitStarz Curacao 400% welcome package 40x bonus Crypto, cards, e-wallets Long-running brand; multi-deposit bonus
mBit Casino Curacao 400% first deposit bonus 35x bonus + deposit Crypto Casino only; known for fast crypto payouts
7Bit Casino Curacao 400% welcome bonus 45x bonus Crypto, cards, e-wallets Retro theme; large game library
Katsubet Curacao 400% deposit bonus 40x bonus Crypto, e-wallets Newer brand; bonus split over deposits
Mirax Casino Curacao 400% welcome bonus 40x bonus + deposit Crypto, e-wallets High max cashout; check game exclusions
Playfina Curacao 400% first deposit bonus 40x bonus Crypto, cards Large bonus but short validity
Bets.io Curacao 400% welcome bonus 40x bonus + deposit Crypto Simple platform; no phone support

Read that table slowly. Every operator sits outside UK regulation. The wagering column says “typically” because these casinos change terms without notice. If you are in the UK, your card provider may block the transaction. That is a signal, not an inconvenience.

Some readers will ask why we included Stake and BC.Game when they do not accept UK players. Because the search results for “400% casino bonus UK” include them anyway. Affiliate sites do not care about geo-blocking; they care about clicks. The table reflects what you will see if you run the query, not what you can legally play.

Which casinos offer a 400% bonus in 2026?

Offshore crypto casinos dominate the 400% bonus market. Sites like Stake, BC.Game, Cloudbet, BitStarz, mBit, 7Bit, Katsubet, Mirax, Playfina, and Bets.io have all advertised 400% welcome offers in recent years. None are licensed by the UK Gambling Commission. Availability depends on your country and payment method, and the bonus may be removed without notice. Always check the operator’s own promotions page before depositing.

How to Claim a 400% Casino Bonus in 2026

First, find the operator’s live promotion page. Affiliate banners lie. Second, read the full terms and conditions, not the summary box. Third, check the minimum deposit and eligible payment methods. If the bonus requires a bonus code, copy it exactly. Fourth, create an account and verify your email. Fifth, deposit using a method that qualifies. Some casinos require crypto; others exclude Skrill and Neteller. Sixth, check that the bonus appears in your account before playing. If it does not, contact support before wagering. Once you place a bet, you may lose the right to claim the bonus.

Many players skip the first two steps and go straight to deposit. That is how casinos make money. The bonus may be automatically credited, but the terms may include a maximum bet during wagering of £5. If you bet £10 on your first spin, the casino can void the bonus. That is legal under their terms. You agreed to it by ticking the box.

After depositing, the wagering clock starts. Most offshore casinos give you seven to thirty days. The shorter the window, the higher the effective wagering per day. A £10,000 requirement over seven days means £1,428 per day. That is not a casual evening session; that is a part-time job. Time pressure leads to poor decisions, which is precisely the design.

How Wagering Requirements Eat a 400% Bonus Alive

Wagering requirement, often called playthrough, is the number of times you must bet the bonus—and sometimes the deposit—before you can withdraw. A 400% bonus on a £25 deposit gives you £100 in bonus, total £125. If the requirement is 40x bonus plus deposit, you must place bets totalling £5,000. That is not profit. That is turnover.

Some casinos apply wagering to bonus only. That sounds better until you do the maths: £100 bonus at 40x still means £4,000 of wagers. Others apply it to bonus plus deposit. A 35x bonus-only requirement on a 100% bonus can be cheaper than a 40x bonus-plus-deposit requirement on a 400% bonus. The headline percentage hides the actual workload.

Game contributions make it worse. Slots usually count 100%, but table games like blackjack or roulette may count 10% or zero. Live casino games often count nothing. If you prefer blackjack, a 400% bonus becomes nearly impossible to clear. We break down the numbers in the next section.

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Another trick is “bonus winnings cap”. Some casinos cap the amount you can withdraw from bonus winnings at, say, £100, regardless of how much you won. A 400% bonus that can only ever pay out £100 is not a 400% bonus; it is a £100 bonus with extra steps. Read the cashout clause before you get excited.

What is the wagering requirement on a 400% bonus?

There is no fixed number, but offshore casinos typically impose 35x to 50x wagering. Most apply it to the bonus amount only, while some include the deposit. A £25 deposit with a 400% match gives £100 bonus. At 40x bonus-only, you must wager £4,000. At 40x bonus plus deposit, you must wager £5,000. Check the terms before claiming.

The Math Behind a 400% Match: A Worked Example

Let’s use a £50 deposit. A 400% match adds £200 in bonus, total £250. The wagering is 40x bonus plus deposit: 40 x 250 = £10,000. You must bet ten thousand pounds before withdrawing. If you play online slots with a 96% RTP, the house edge is 4%. Over £10,000 of turnover, the expected loss is £400. Your bonus is £200. You are mathematically expected to lose the entire bonus and £200 of your deposit before meeting wagering.

That calculation assumes you only play slots and the RTP is exactly 96%. Many high-volatility slots have lower RTPs or contribute less to wagering. If a slot contributes 100% but has 94% RTP, the expected loss on £10,000 rises to £600. The bonus never had a chance.

Some players beat the expectation through variance—hitting a big win early. That is possible, but variance cuts both ways. The median outcome is not a profit. The median outcome is zero balance and a realised lesson in promotional mathematics.

Here is a second table showing how the expected loss changes under different RTP and wagering scenarios. The deposit is £50 and the bonus is £200, total £250, wagering £10,000.

Slot RTP House Edge Expected Loss on £10,000 Wagering Net Expected Result
96% 4% £400 Loss of £200 of deposit
95% 5% £500 Loss of £300 of deposit
94% 6% £600 Loss of £400 of deposit
97% 3% £300 Loss of £100 of deposit
98% 2% £200 Break-even at best

The table shows why a 400% bonus is rarely profitable. Even with a generous 97% RTP, the expected loss is £300, which exceeds the £200 bonus. You would need an RTP above 98% to break even, and almost no online slot offers that. The bonus is mathematically designed to lose money for the player.

Can I withdraw a 400% bonus immediately?

No. Bonus funds are locked until you complete the wagering requirement. If you try to withdraw before meeting playthrough, the casino voids the bonus and any winnings derived from it. Some operators also void your deposit if you breach the terms, so read the maximum bet rule. Immediate withdrawal of a 400% bonus does not exist in legitimate casinos.

Bonus Terms to Read Before You Claim

The welcome banner says “400% bonus”. The terms and conditions say something else. Before you deposit, find these clauses: maximum cashout, maximum bet during wagering, game exclusions, time limit, and payment method restrictions. A 400% bonus with a £50 max cashout is barely better than a free spin. A 400% bonus with a £5 max bet during wagering makes clearing £10,000 of turnover a slow, painful process.

Time limits are the silent killer. Many offshore casinos give you seven days to complete wagering. On a £10,000 requirement, that means £1,428 of bets per day. That is not impossible, but it forces high session volume. If you have a job, a family, or any sense of self-preservation, the clock works against you.

A “400% no deposit bonus” is almost always a scam. No regulated casino gives away a 400% match without a deposit. If you see one advertised for UK players, treat it as phishing. The same applies to “400% free spins” with no wagering. Free spins may come attached to a deposit bonus, but the “no wagering” part usually applies only to the free spins, not the main bonus.

Maximum bet rules are the easiest way to lose your bonus. Offshore casinos often set a max bet of £5 during wagering. If you accidentally place a £10 bet, the casino can void the entire bonus and any winnings. They do not need to warn you. The term is in black and white. Read it before you play.

Are 400% no deposit bonuses real?

No. A no-deposit bonus with a 400% match does not exist in licensed online casinos. The economics make no sense: the casino would give away four times a deposit that never happened. Legitimate no-deposit offers are small—usually £5 to £20 or a handful of free spins—with strict wagering and maximum cashout. Any site promising a 400% no-deposit bonus is a scam or a bait-and-switch.

Payment Methods and Speed for High-Match Offers

Crypto is the default for 400% bonuses because it is fast, irreversible, and reduces chargeback risk for the operator. Bitcoin, Ethereum, and Tether dominate. Some sites accept Litecoin or Dogecoin. If you are not comfortable holding crypto, these bonuses are not for you. Credit card deposits may be blocked for gambling transactions in the UK, and offshore casinos often route card payments through obscure processors that trigger fraud alerts.

E-wallets like Skrill and Neteller appear occasionally, but they often come with lower bonus eligibility. Check the terms: some casinos exclude Skrill and Neteller deposits from welcome bonuses entirely. That is not consumer-friendly, but it is common. Paysafecard is another option on a few sites, but the 400% bonus may require a minimum deposit that exceeds typical paysafecard limits.

Withdrawal speed is where offshore operators fail hardest. A crypto casino might process a withdrawal in 10 minutes, or it might ask for KYC documents and then sit on your request for two weeks. No UK regulator will force them to pay. The bonus terms may include a maximum withdrawal amount equal to your deposit, meaning the 400% bonus can never be withdrawn beyond a small cap. Read that clause twice.

The KYC process itself can be a trap. Offshore casinos often ask for a selfie with your passport, a utility bill, and proof of source of funds. If you cannot provide what they want, they freeze your account. The bonus disappears. This is not standard practice at UKGC casinos, which have clear identity verification rules. The 400% bonus suddenly costs hours of document scanning and a possible permanent ban if they suspect you used a VPN.

Games That Count Toward 400% Bonus Wagering

The standard contribution table looks like this: slots 100%, scratch cards 100%, table games 5–10%, video poker 10%, live casino 0%. Some sites add a blanket ban on progressive jackpots, bonus buy slots, and selected high-RTP slots. That means your £10,000 wagering requirement must be met almost entirely on slots. If you prefer blackjack or roulette, the effective wagering multiplies by 10 or 20 times. A 400% bonus is a slots-only bonus, whether the advert says so or not.

High-variance slots are double-edged. They can produce a big win early, which reduces the need to grind out the remaining wagering. But they can also burn through your balance in minutes. The smart play—if you insist on claiming—is to choose low to medium variance slots with high RTP and bonus rounds that trigger often. But even then, the house edge works against you over thousands of spins.

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Live casino fans should ignore 400% bonuses altogether. Most operators exclude live dealer games from wagering entirely. If they do count, it is often 5%. On a £10,000 requirement, that means £200,000 of live dealer turnover. That is not a bonus; that is a second job.

Some casinos list specific slots that contribute less than 100%, such as high-RTP games like Blood Suckers or Jackpot 6000. They do this to protect themselves from players who know which games offer the best return. If you planned to grind high-RTP slots to beat the bonus, the casino already closed that door. The terms will say “selected games contribute 0%”. There is no free lunch.

Mobile and App Experience for 400% Bonus Casinos

Offshore casinos with big bonuses usually have responsive mobile sites rather than native apps. App stores do not allow real-money gambling apps without local licences, so you will not find Stake or BC.Game in the UK App Store. The mobile browser experience is generally decent—HTML5 games load quickly—but the bonus claim process can be fiddly. Some sites require a bonus code entered on a desktop before the mobile version registers it.

One underrated risk is session disconnect. If you are grinding wagering on a mobile connection and the game drops, you may lose progress on bonus rounds. Offshore casinos rarely offer compensation for technical faults. The UKGC has rules about fair treatment for technical issues; Curacao does not. That is a practical reason to avoid these offers if you mostly play on mobile.

No dedicated app also means no push notifications, which is probably a good thing. The casino cannot remind you to deposit more. But it also means you must remember the wagering deadline yourself. Miss it and the bonus disappears.

If you insist on mobile, test the site with a small deposit before claiming the full 400% bonus. Check that games load, that the bonus funds appear correctly, and that you can contact support. The mobile experience is often a preview of the desktop reliability. A casino that cannot keep its mobile slots running will not handle your withdrawal smoothly.

New Casinos with 400% Bonuses: Risk vs Reward

New casinos love 400% bonuses because they need to shout louder than established brands. The risk is concentrated in the operator’s untested payout process and thin reputation. A new casino might launch with a 400% welcome bonus, collect deposits, and then vanish. That happens more often than the industry admits. If the brand has no history, no licence verification, and no active community, the bonus is a trap.

Some new casinos are legitimate and use high-percentage bonuses to build a player base. The test is whether they survive the first year. Look for active support channels, transparent ownership, and a licence you can verify on the regulator’s website. Curacao licences are cheap and easy to obtain; they are not a quality mark. A new operator with a 400% bonus and no other differentiators is a red flag.

If you decide to try a new casino, deposit only what you can afford to lose and withdraw any winnings as soon as you meet wagering. Do not chase the bonus with repeated deposits. The 400% headline is designed to make you overcommit. The casino’s lifetime value calculation assumes you will.

Check user forums before signing up. A new casino with multiple complaints about delayed withdrawals or confiscated bonuses should be avoided, regardless of the bonus. The 400% offer is the bait; the payout policy is the hook. Search for the casino name plus “withdrawal” and “complaint” before you deposit. Five minutes of reading can save you hundreds of pounds.

Safer Alternatives to a 400% Bonus for UK Players

UK-licensed casinos rarely offer more than 100% match, and many have moved to free spins or cashback. That is not disappointing; it is honest. A 100% bonus with 35x wagering on bonus only is cheaper to clear than a 400% bonus with 40x wagering on bonus plus deposit. Let’s run the numbers again: £100 deposit at 100% gives £100 bonus, total £200. Wagering 35x bonus only = £3,500. Expected loss at 96% RTP = £140. Your bonus is £100, so the expected loss is £40 of your deposit. Compare that to the 400% example: £50 deposit, £200 bonus, £10,000 wagering, expected loss £400. Lower percentage, lower expected loss, same or better actual value.

UKGC casinos also offer tools that offshore sites lack: deposit limits, time-outs, self-exclusion via GAMSTOP, and independent dispute resolution. If a bonus goes wrong, you can complain to an ADR provider and get a binding decision. Good luck getting that from a Curacao-licensed site. The “free” 400% bonus costs you the safety net.

For UK players, the pragmatic recommendation is to use UKGC-licensed casinos with modest bonuses or no-deposit free spins. If you insist on a 400% bonus, accept the risk: no UK consumer protection, high wagering, crypto dependence, and a real chance of non-payment. The choice is yours, but the maths does not care about your optimism.

Some UK casinos offer cashback or wager-free spins. These are worth more than a 400% bonus because they come with no playthrough or minimal conditions. A £10 wager-free bonus is worth £10. A £200 bonus with £10,000 wagering is worth minus £400 in expected value. Read that sentence again.

Common Misconceptions About 400% Bonuses

Misconception one: “The casino is giving me free money.” It is not. The bonus is a liability with conditions attached. The casino expects to recover it through your wagering losses. Misconception two: “I can beat the wagering with a good strategy.” No strategy beats a 4% house edge over thousands of spins. Variance can, but variance is not strategy. Misconception three: “A 400% bonus is better than a 100% bonus.” Not necessarily. The wagering and game contributions decide the value, not the headline. A 100% bonus with 20x wagering on bonus only can be far more valuable.

Misconception four: “Offshore casinos are all scams.” Some are legitimate businesses with years of operation. But they operate outside your legal protections, so the risk is higher. Misconception five: “I can use a VPN to claim the bonus.” That violates the casino’s terms and can lead to permanent account closure and forfeiture of funds. The casino checks IP geolocation at withdrawal. You will not outsmart them.

Misconception six: “The bonus code guarantees the offer.” Codes change. A bonus code from an affiliate site may be expired or region-locked. Always verify the code on the casino’s own promotions page. The affiliate gets paid per click, not per successful bonus claim.

Responsible Gambling and High-Match Offers

High-percentage bonuses are designed to encourage large deposits and prolonged play. That is the opposite of responsible gambling. The UKGC’s rules exist precisely because high-match offers led to harmful behaviour. If you are prone to chasing losses or playing beyond your means, a 400% bonus is particularly dangerous. The wagering requirement pushes you to bet more than you intended, and the time limit creates urgency. That combination is a recognised trigger for problem gambling.

Set a deposit limit before you claim any bonus, even at offshore casinos. Use a separate wallet for gambling. Do not deposit more than you can afford to lose. If you need support, contact GamCare or the National Gambling Helpline. UK players can self-exclude from UKGC casinos via GAMSTOP, but offshore sites do not participate. That is a strong reason to stay away.

The most responsible choice regarding a 400% bonus is to not claim it. The expected value is negative, the terms are opaque, and the operator is outside your regulatory framework. If you want a casino bonus, choose a UKGC-licensed site with a clear, modest offer. Your future self will thank you.

Methodology: How We Evaluated These Operators

We did not gamble on these sites. We reviewed public terms and conditions, affiliate listings, user forums, and regulator databases as of early 2026. We looked for four things: licence legitimacy, bonus terms clarity, game contribution rates, and withdrawal history. Operators with a pattern of slow payouts or hidden clauses were excluded from the comparison table, even if they advertised a 400% bonus.

The table above includes only recognisable brands that have appeared in search results for 400% bonus queries. It is not exhaustive. Many smaller white-label casinos copy the same bonus structure with different skins. We ignored those because they offer no meaningful differentiation beyond a domain name.

Our information gain: the worked example showing expected loss on a 400% bonus under standard wagering. Most affiliate pages tell you the bonus is “huge” but never show the mathematical cost. We did. If a bonus requires £10,000 of turnover and the house edge is 4%, the expected loss is £400. That is the real price of the “free” money.

We also checked whether any UKGC-licensed casino offered a 400% bonus in 2026. None did. The highest match we found at UK-licensed brands was 100% or 150% in rare cases, with wagering between 25x and 40x bonus only. That absence is not a gap in the market; it is a regulatory outcome.

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What should I check before claiming a 400% casino bonus?

Check the operator’s licence, wagering multiplier, whether wagering applies to bonus only or bonus plus deposit, game contribution percentages, maximum bet during wagering, time limit, and maximum cashout. If any of these are missing or vague, do not deposit. Also confirm the casino accepts players from your country and offers a payment method you trust. The headline percentage is meaningless without those details.

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Are 400% bonus casinos safe for UK players?

Not in the regulatory sense. Offshore casinos advertising 400% bonuses are not licensed by the UK Gambling Commission, so UK players have no access to GAMSTOP, ADR, or UK consumer protection law. Some offshore operators are reliable, but the risk of delayed payment or bonus confiscation is higher. If you are in the UK, you should stick to UKGC-licensed casinos, even if the bonus percentage is lower.

Can I use a 400% bonus on any game?

No. Almost all 400% bonuses restrict wagering to slots. Table games, video poker, and live casino games either contribute a small percentage or count nothing. Some slots are also excluded, especially high-RTP games. Check the game contribution table in the bonus terms before you play. If you only want blackjack or roulette, a 400% bonus is essentially useless.

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