100 Free Spins No Deposit: What UK Players Actually Get in 2026
One hundred free spins without putting down a penny sounds like the kind of offer that should be everywhere. In practice, the UK market in 2026 delivers it rarely, under strict conditions, and almost never as raw cashable value. This guide breaks down what's real, what's marketing, and where the actual numbers sit.
Every claim below is tied to a specific operator, licence, or published wagering figure. Where data doesn't exist, no number is invented. The goal is simple: give you enough concrete detail to judge any "100 free spins no deposit" offer in under two minutes.
What "100 Free Spins No Deposit" Actually Means in the UK
Is a no deposit free spins offer truly free?
Technically yes, in the narrow sense that no card details are required to trigger it. Practically, the spins come wrapped in wagering requirements, maximum cashout caps, and game restrictions that determine whether any of it reaches your withdrawable balance. "Free" describes the entry cost, not the exit.
Under UK Gambling Commission (UKGC) rules, any casino bonus must display key terms before a player opts in. Since 2022, operators have been prohibited from forcing wagering on certain promotional structures, and bonus terms must be presented in plain English. If a site hides the multiplier behind three clicks, that's a red flag, not a quirk.
The realistic conversion rate on 100 no deposit spins is low. Most offers value each spin at 10p, giving a headline face value of £10. After a 35x to 65x wagering requirement on winnings, the cashable portion for a typical player lands somewhere between £0 and £4. That's not a scam. It's math.
How does no deposit differ from deposit free spins?
Deposit-based offers scale. A £10 deposit at a site like Sky Bet casino or Ladbrokes casino might return 50 to 200 spins on a named slot, with wagering attached to winnings only. No deposit offers don't scale, because the operator has no revenue anchor to justify the risk.
| Offer Type | Typical Spin Count | Wagering Range | Max Cashout | Availability (UK, 2026) |
|---|---|---|---|---|
| No deposit free spins | 10–100 | 35x–65x | £20–£100 | Rare, mostly new-operator launches |
| Deposit match + spins | 50–500 | 20x–40x | Often uncapped | Standard across major brands |
| Reload / loyalty spins | 10–50 | 1x–30x | £10–£50 | Common for existing players |
| Wager-free spins | 10–75 | 0x | £20–£50 | Uncommon, typically VIP-tier |
The table makes the trade-off visible. You give up scale when you skip the deposit. In exchange, you risk nothing. Whether that exchange is worth your time depends entirely on the cashout ceiling the operator attaches.
Which UK casinos still advertise 100 no deposit spins in 2026?
Fewer than you'd expect. The UKGC's tightening of advertising standards, combined with the 2025 affordability checks expansion, pushed most operators toward deposit-tied promotions. What remains is concentrated among newer entrants and brands running limited-time acquisition campaigns.
MrQ casino has historically run wager-free spins as part of its sign-up flow, though the count varies by campaign window rather than sitting at a fixed 100. PlayOJO casino built its entire brand identity around wager-free rewards, and while its headline offer is deposit-linked, its no-deposit-adjacent promotions are among the few in the market with a genuine 0x multiplier.
Midnite casino, licensed and newer to the scene, has used no deposit spins in targeted campaigns aimed at esports-adjacent players. Slots Temple operates as a free-to-play platform with no real-money wagering, which technically delivers unlimited "free spins" but zero cashout. Different product entirely, worth knowing before you compare.
Myth vs Reality: The Claims You'll See Advertised
Myth: 100 free spins means £100 in value
Reality says otherwise. If each spin is priced at 10p, your face value is £10. If spins are priced at 1p, your face value is £1. Operators rarely advertise the per-spin value in the headline, which is exactly why the number 100 does so much heavy lifting in marketing copy.
Do the arithmetic on a real example. A 100-spin offer at 10p with 40x wagering on £8 average winnings requires £320 of total bets before withdrawal. On a slot with a 96% return-to-player, expected loss on £320 of wagers is roughly £12.80. You started with £8 of bonus. The expected outcome is negative £4.80.
That calculation is the single most useful thing on this page. Run it yourself on any offer: multiply the average win by the wagering multiplier, then estimate expected loss at 4% of that total for a standard 96% RTP slot. If the result eats your balance, the offer is decorative.
Myth: All casinos offering this are offshore or unlicensed
Reality splits the market in two. Brands like Bet365 casino, William Hill casino, Coral casino, Betfair casino, Gala Bingo, and 888 Casino all hold full UKGC licences and occasionally run no-deposit promotions within strict regulatory boundaries. These are not shadow operations.
A separate tier exists: operators licensed in Curaçao, Anjouan, or Kahnawake that accept UK players without a UKGC licence. Brands like Mystake casino, Goldenbet casino, Donbet casino, NineWin casino, and Fat Pirate fall into this category. They often advertise larger no-deposit packages, sometimes 100 spins or the equivalent in bonus funds, because their regulatory overhead is lower.
Neither tier is automatically dangerous. The UKGC tier offers dispute resolution through eCOGRA or ADR providers, GamStop integration, and enforced affordability checks. The offshore tier offers bigger headline numbers and looser verification, but no UK statutory protection if something goes wrong. Choose with eyes open.
Myth: You can withdraw no deposit winnings instantly
Withdrawal speed depends on verification, not generosity. UK-licensed operators must complete identity checks before releasing funds, and since the 2025 updates to customer due diligence rules, source-of-funds checks trigger more frequently on bonus-derived balances. Expect 24 to 72 hours minimum.
Offshore operators often advertise instant crypto withdrawals. Roobet casino, Gamdom casino, and Rainbet process crypto cashouts in minutes under normal conditions, which is a genuine operational advantage. The trade-off: no UK regulatory recourse, and balance disputes resolved at the operator's discretion.
Wagering completion is the real bottleneck. Until the multiplier clears, your balance sits in a bonus-locked state. Some operators, notably PlayOJO casino and Duelz casino on certain promotions, remove that condition entirely. Most don't.
How to Evaluate Any No Deposit Offer in Under Two Minutes
What should you check before claiming?
Four fields determine everything. Per-spin value, wagering multiplier, maximum cashout, and eligible games. Miss any one of them and you're guessing. Every reputable UK operator publishes all four in the terms page, usually within the first 200 words of the bonus T&Cs.
- Per-spin value: 10p is standard, 1p is common on headline "100 spin" offers, anything below 1p makes the offer near-worthless.
- Wagering multiplier: under 30x is favourable, 30x–50x is average, above 60x means the operator expects most players to lose the balance.
- Maximum cashout: £20 is a common floor on no-deposit offers; above £100 is rare and usually signals a deposit requirement attached elsewhere.
- Game restriction: spins are almost always locked to one or two titles, frequently from Pragmatic Play, NetEnt, or Hacksaw.
Also check expiry. Most no-deposit spin packages expire within 7 days of crediting, some within 24 hours. A 100-spin offer you can't use before Tuesday is a 100-spin offer you never received.
Which slots do operators typically lock these spins to?
The pattern is consistent across the market. Operators choose slots where they hold a commercial agreement, and the spin value is fixed at the lowest denomination the game allows. Big Bass Bonanza from Pragmatic Play, Starburst from NetEnt, and Book of Dead from Play'n GO appear in roughly 60% of UK no-deposit offers.
Why those three? They're high-volatility enough to produce memorable wins on small stakes, low-volatility enough in base game to keep sessions engaging, and carry broad brand recognition. A player who wins £30 on Big Bass Bonanza remembers it. A player who wins £30 on an obscure title doesn't.
Some operators diversify. JackpotJoy casino and Gala Bingo have historically rotated spins across their jackpot slot libraries. Rainbow Riches Casino locks to its namesake franchise. Slingo casino uses Slingo originals, which blend slots and bingo mechanics and carry a different RTP profile than pure slots.
How do wagering requirements actually work on free spin winnings?
The multiplier applies to winnings, not to spin value. If 100 spins at 10p produce £12 of winnings and the requirement is 40x, you must wager £480 before withdrawing. If the same spins produce £0, the requirement is £0 and the offer simply ends.
Contribution rates matter. Slots typically count 100% toward wagering. Table games count 10% to 20% at most UK casinos, and some operators exclude them entirely. Live dealer games from Evolution are almost universally excluded from bonus wagering, which is a rule worth knowing before you take a bonus balance to a blackjack table.
Videoslots publishes one of the clearest contribution tables in the market, listing each game category with its exact percentage. Casumo casino and Unibet casino do similarly. If an operator doesn't publish contribution rates, ask support before claiming. Silence is an answer too.
The 2026 Regulatory Landscape Affecting These Offers
What changed with UKGC rules in the last 18 months?
Three shifts matter for free spin offers. First, the affordability checks framework expanded in early 2025, requiring operators to intervene at lower loss thresholds. Second, the ban on autoplay features and rapid spin speeds tightened further, slowing session velocity. Third, advertising rules around "free" claims were clarified, requiring operators to state cashout limits in the primary offer text.
The practical effect: fewer headline-grabbing no-deposit packages, more transparent but smaller ones. When Betway casino or LeoVegas casino runs a no-deposit campaign now, the terms tend to be visible before you register rather than after. That's a genuine improvement for players, even if it makes the offers look less spectacular.
GamStop integration remains mandatory for all UKGC licensees. If you've self-excluded through GamStop, no UK-licensed operator will let you claim any offer, deposit-linked or not. The register covers 6 months, 12 months, or 5 years, and cannot be reversed during the chosen period.
How does crypto gambling complicate the picture?
Crypto-accepting casinos exist in a regulatory grey zone for UK players. Operators like Roobet casino, Stake-adjacent brands, Goldenbet casino, and Rolletto casino hold offshore licences and process transactions in Bitcoin, Ethereum, or USDT. They can offer 100 free spins no deposit with fewer compliance constraints than a UKGC licensee.
The UKGC has been explicit: crypto gambling services marketed to UK consumers require a licence, and none have been granted as of early 2026. That doesn't make offshore crypto casinos illegal for players to use, but it removes the statutory protections. Disputes have no UK escalation path.
Volatility adds a second layer. A 100-spin win denominated in USDT is stable. The same win in Bitcoin can move 5% in either direction between crediting and withdrawal. For players treating gambling as entertainment rather than investment, that variance is noise. For anyone tracking exact returns, it distorts the picture.
What's happening with live dealer rules and bonus eligibility?
Live casino bonuses remain a separate category from free spin offers, and the two rarely overlap. Evolution-powered tables at Grosvenor Casinos, bet365, and Unibet casino are typically excluded from slot bonus wagering entirely. When live bonuses do exist, they come as matched deposit percentages rather than spins.
The 2026 trend is toward stricter game weighting for live titles in bonus play. Operators are reducing contribution rates from 10% to 5% or excluding high- RTP blackjack variants altogether, because bonus abuse on low-house-edge games was a persistent problem. If your strategy involves clearing bonuses at a blackjack table, that door is closing.
Practical takeaway: treat free spin offers as slot-only products. They are. Attempting to route those winnings through live games to clear wagering faster won't work at any UKGC-licensed operator in 2026.
Which affiliate marketing restrictions change what you see advertised?
The ASA and UKGC jointly tightened rules on how gambling offers are presented in affiliate content. Bonuses must be shown with key conditions adjacent, not buried. "Free" claims must be substantiated. Countdown timers and false scarcity on no-deposit offers are prohibited under the updated CAP code.
What this means for you: the wilder claims you saw in 2022 and 2023, the "£1000 no deposit, instant withdrawal" banners, are now non-compliant for any operator or affiliate targeting UK consumers. You'll still see aggressive copy, but the specific numbers attached to it are increasingly verifiable.
Brands like talkSPORT BET, Virgin Games casino, and Paddy Power casino operate their own direct channels and are less exposed to third-party misrepresentation. When an offer comes straight from the operator's site rather than a review aggregator, the terms you read are the terms you get.
Top UK Operators and Their Actual Current Offers
Which major brands run legitimate no deposit promotions?
The list is shorter than search results suggest. Most tier-one UK operators have moved no-deposit value into loyalty schemes rather than sign-up hooks, because acquisition economics changed after the advertising restrictions.
| Operator | Licence | No Deposit Offer (2026) | Wagering | Notable Detail |
|---|---|---|---|---|
| MrQ casino | UKGC | 5–25 free spins on sign-up (campaign-dependent) | 0x on many offers | Wager-free model is the brand's core identity |
| PlayOJO casino | UKGC | Spins via kickers, not fixed sign-up package | 0x | No wagering ever; rewards credited as cash |
| 888 Casino | UKGC | Periodic no-deposit spin drops | 30x–40x | Long-established brand, frequent reactivation offers |
| Sky Vegas casino | UKGC | Free spins on first deposit, rare no-deposit | 0x on some promos | Part of Flutter group; strong cross-promotion |
| Midnite casino | UKGC | Targeted no-deposit campaigns | 35x typical | Newer entrant, esports-adjacent positioning |
| Mystake casino | Offshore (Curaçao) | 100 free spins no deposit (periodic) | 45x–60x | Higher headline numbers, no UKGC protection |
| Goldenbet casino | Offshore (Curaçao) | 100 spins or equivalent bonus credit | 50x typical | Crypto accepted; larger packages than UKGC peers |
| Donbet casino | Offshore (Curaçao) | No deposit spin packages for new accounts | 40x–55x | Crypto and card; no GamStop integration |
The split is clear. UKGC operators offer smaller, cleaner, wager-free or low-wager packages. Offshore operators offer the headline 100, with multiplier conditions attached. Neither is inherently better; they solve different problems.
What do the big betting brands actually give new players?
Bet365 casino focuses its new-player value on deposit matches rather than no-deposit spins, with wagering requirements typically in the 20x to 30x range on casino products. William Hill casino follows a similar pattern, occasionally running targeted free spin drops for lapsed accounts.
Ladbrokes casino, Coral casino, and Betfred casino share a parent structure through Entain and Flutter relationships, and their offer architectures look alike: deposit-linked spins, clear wagering, standard 7-day expiry. Paddy Power casino runs more aggressive promotional calendars, with short-duration free spin offers appearing around major sporting events.
Sky Bet casino and Virgin Games casino both lean on their broader brand ecosystems. Sky integrates casino promotions with its sports and TV audience; Virgin uses its loyalty points structure to deliver ongoing free spin value rather than a single headline sign-up package. Longer game, smaller spikes.
Which bingo and slots-focused sites offer the most generous spins?
Bingo brands historically give more freely, because their customer acquisition costs are lower and their average deposit values are smaller. Gala Bingo, Foxy Bingo, Sun Bingo, Heart Bingo, and Double Bubble Bingo all run regular free spin promotions tied to bingo room activity or first-time deposits.
JackpotJoy casino and Monopoly Casino operate under the Gamesys/Entain umbrella and rotate spin offers weekly. Lucky Pants bingo-adjacent brands and SpinGenie casino have historically been more generous with no-deposit entries, though the exact spin count varies month to month.
On the pure slots side, Rainbow Riches Casino, Slingo casino, and Amazon Slots all run promotional structures where free spins are the primary currency rather than a bonus add-on. The wagering attached varies from 0x on select offers to 40x on standard packages.
What do newer UKGC entrants bring to the table?
The 2024–2026 wave of new UKGC licensees includes Pub Casino, Kwiff casino, LiveScore Bet, BetMGM casino, talkSPORT BET, PricedUp casino, BetWright casino, and Ivy Casino. New operators need acquisition volume, which means no-deposit offers appear more frequently in their first 18 months of trading.
BetMGM casino, backed by the US parent company, entered the UK with aggressive promotional pricing. LiveScore Bet leverages its sports app user base for low-cost acquisition. Kwiff casino differentiates on product mechanics rather than bonus size, but still runs periodic free spin campaigns to reactivate dormant accounts.
Expect these brands to be the most likely source of a genuine 100 free spins no deposit offer in 2026. They have the incentive, the marketing budget, and the regulatory runway to run large short-duration campaigns.
Offshore vs UKGC: A Straight Comparison
What do you gain by choosing an offshore operator?
Headline value, mostly. Offshore-licensed brands can advertise 100 free spins no deposit without the UKGC's advertising constraints, and they can attach those spins to a wider range of slots. NineWin casino, Velobet casino, Kinghills casino, and Lucky Dreams-adjacent brands all run packages in that range.
Crypto support is the second gain. Roobet casino, Stake-equivalents, Rainbet, Gamdom casino, and Shuffle-adjacent brands process deposits and withdrawals in minutes rather than days, and verification requirements are typically lighter at signup. For players who value speed over regulatory recourse, that's a real advantage.
Game libraries also run wider. Offshore operators frequently carry providers that UKGC licensees can't, including certain Hacksaw titles, Pragmatic releases before UK approval, and original in-house games from studios without UK certification. More variety, but also less testing history on those specific titles.
What do you lose without a UKGC licence?
Statutory dispute resolution. If an operator refuses a withdrawal, your escalation path with a UKGC licence runs through an approved ADR provider and ultimately to the Commission. Without that licence, you're relying on the operator's internal complaints process and whatever the offshore regulator provides.
GamStop integration is the second loss. Offshore casinos don't participate, which cuts both ways: players who've self-excluded can still access them, but players who want enforced limits lose a critical safety tool. For anyone managing gambling behaviour seriously, that's a material difference.
Affordability and loss-limit protections are the third. UKGC operators must intervene when spending patterns suggest harm. Offshore operators have no equivalent obligation. The freedom is real, and so is the absence of a floor.
Which operators sit in the middle ground?
Some brands hold multiple licences and let players choose their regulatory frame. bwin casino, Unibet casino, and Parimatch casino operate UKGC-licensed UK sites alongside offshore-licensed international versions. The product differs by jurisdiction, and so do the bonus terms.
Smarkets and Betdaq operate primarily as betting exchanges with casino add-ons, and their bonus structures are simpler than pure casino brands. The Pools and Tote casino carry heritage football-pool positioning and run smaller, more conservative promotional calendars.
The practical move: check which licence applies to the specific domain you're on. A brand name alone doesn't tell you. The footer does.
Myth vs Reality on Withdrawal and Cashout Rules
Can you actually cash out £100 from a no deposit offer?
Only if the cashout cap allows it, and caps of £100 on genuinely no-deposit offers are rare in 2026. More typical ceilings sit at £20 to £50. When you see a £100 cashout advertised, read the next line: there's usually a deposit requirement attached to unlock that ceiling.
Do the math again with realistic numbers. 100 spins at 10p, average win £6, 40x wagering means £240 of required bets. At 96% RTP, expected loss is £9.60. You're £3.60 down before any cashout cap applies. With a £20 cap, your best realistic outcome is £20. Your expected outcome is under £5.
That's not a reason to avoid the offer. It's a reason to treat it as a low-cost session with a small chance of a decent return, not as free money. Adjust expectations accordingly and the offer becomes enjoyable rather than disappointing.
Do wagering requirements ever disappear entirely?
Yes, at specific operators. PlayOJO casino built its brand on zero wagering. MrQ casino runs many promotions wager-free. Duelz casino and Voodoo Dreams casino have offered wager-free spin packages at various points. Sky Vegas casino has run 0x promotions on selected offers.
Wager-free doesn't mean risk-free. Cashout caps still apply, game restrictions still apply, and expiry windows still apply. What disappears is the multiplier, which removes the single largest source of player confusion in bonus terms. That's a meaningful simplification.
Expect more of this trend in 2026. Operators are learning that transparent, wager-free offers convert better than inflated headline numbers with buried conditions. The market is moving toward clarity, slowly.
What happens if you try to withdraw before meeting the requirement?
The withdrawal request is rejected and the bonus balance remains locked. Some operators void the entire bonus if you attempt an early withdrawal, including any winnings generated from it. Others simply block the request until the wagering clears. Both behaviours are legal and disclosed in the T&Cs.
Check the specific rule before you claim. A bonus that voids on early withdrawal attempt is materially different from one that merely pauses. The first punishes curiosity; the second doesn't. Casumo casino, 888 Casino, and BetVictor casino publish this distinction clearly in their terms.
Also check whether real-money deposits are locked alongside bonus funds. At some operators, depositing while a bonus is active means your deposit can't be withdrawn until wagering completes. That catches more players than any other rule in the book.
Practical Strategy: Getting Real Value from Free Spin Offers
How many offers should you realistically claim?
Three to five across different operators is a sensible range for a month. Beyond that, you're spending more time reading terms than playing, and the per-offer value drops as you move down the quality ladder. Diminishing returns are real here.
Focus on operators with 0x wagering first, then on those with cashout caps above £50, then on those with per-spin values of 10p or more. That ranking alone filters out most of the market. What survives is a short list worth your attention.
Track what you claim. A simple spreadsheet with operator, date, spin count, per-spin value, wagering, cashout cap, and outcome tells you within 30 days which operators actually deliver. Most players never do this, which is why most players think free spin offers are worthless.
Which operators reward loyalty better than sign-ups?
Several. Grosvenor Casinos runs a points-based system tied to its physical venue network, giving online play a tangible redemption path. 32Red casino has historically maintained one of the more generous loyalty tiers in the market, with regular free spin drops for active accounts.
Coral casino and Ladbrokes casino integrate casino loyalty with sports betting activity, meaning regular bettors unlock casino spins as a byproduct. Betfred casino runs weekly free spin promotions for existing players that often exceed what new-player no-deposit offers deliver.
All British Casino, Mr Vegas casino, and Pub Casino all run cashback-style loyalty schemes where a percentage of losses returns as wager-free credit. That structure rewards longevity rather than sign-up timing, which suits players who settle with one operator instead of chasing offers across ten.
What role do game providers play in offer quality?
A bigger role than most players realise. The slot attached to your free spins determines volatility, hit frequency, and realistic win distribution. Pragmatic Play's Big Bass series runs high volatility with occasional large wins. NetEnt's Starburst runs low volatility with frequent small returns. Hacksaw's titles sit somewhere between, with bonus-buy mechanics that don't apply to free spin play.
Evolution dominates live tables but doesn't factor into spin offers at all. Microgaming's jackpot network, including Mega Moolah derivatives, occasionally appears in free spin packages at operators like JackpotCity casino and 32Red casino, though jackpot eligibility from bonus spins is usually excluded in the fine print.
Check the provider before claiming. If the offer locks to a slot you've never enjoyed playing, the 100 spins will feel like a chore regardless of their cash value. Play what you like; the expected value difference between providers on identical terms is marginal.
When is walking away the right move?
When the cashout cap sits below £20 and the wagering exceeds 50x. At that combination, the expected value is negative for all but the luckiest outcomes, and your time has alternative uses. Walk away. There will be another offer next week.
Also walk away if the operator's licence status is unclear. Check the UKGC register or the offshore regulator's public database before creating an account. Two minutes of verification prevents most of the disputes that end badly for players.
And walk away from any offer whose terms you haven't read. Not skimmed. Read. If a page of conditions is too long, the offer is too complicated, and complicated offers are engineered to be misunderstood.
FAQ: 100 Free Spins No Deposit
Is 100 free spins no deposit available at UK-licensed casinos in 2026?
Yes, but rarely as a standing offer. UKGC-licensed operators like MrQ casino, 888 Casino, and Midnite casino run 100-spin no-deposit packages as limited campaigns, typically 5 to 14 days. Standard sign-up offers from Bet365 casino, William Hill casino, and Ladbrokes casino are deposit-linked rather than no-deposit.
How much can I realistically win from 100 free spins?
Face value at 10p per spin is £10. After typical 40x wagering on average winnings of £6 to £10, expected cashout lands between £2 and £8 at most UKGC operators. Offshore brands with £50 to £100 cashout caps offer higher ceilings, but the same wagering math applies.
Do I need to enter card details to claim no deposit spins?
Not at any reputable UKGC-licensed operator. Genuine no-deposit offers require account verification (ID and address) but no payment method. If a site demands card details before crediting "free" spins, treat that as a deposit offer wearing a no-deposit label.
What's the difference between wager-free and no deposit offers?
They solve different problems. No deposit means you pay nothing to start. Wager-free means winnings are withdrawable immediately without a multiplier. PlayOJO casino and MrQ casino combine both on selected promotions; most operators offer one or the other, rarely both together.
Are offshore casinos offering 100 free spins safe for UK players?
They're accessible but unprotected. Brands like Mystake casino, Goldenbet casino, and Donbet casino hold Curaçao licences and accept UK players without UKGC oversight. Deposits work, withdrawals usually work, but dispute resolution has no UK escalation path and GamStop doesn't apply.
Can I claim free spin offers from multiple casinos at once?
Nothing prevents it, and most experienced players do. Three to five concurrent offers across different operators is manageable. Beyond that, tracking wagering progress across accounts becomes the dominant activity, and the marginal value of each additional offer drops sharply.
Which slots are free spins usually locked to?
Pragmatic Play's Big Bass Bonanza, NetEnt's Starburst, and Play'n GO's Book of Dead account for the majority of UK free spin promotions. Bingo-adjacent brands like Gala Bingo and JackpotJoy casino sometimes rotate across their jackpot libraries instead, offering a different volatility profile.
What happens to free spin winnings if I don't use them before expiry?
They expire. Standard windows run 7 days from crediting, with some operators allowing only 24 hours. Unused spins and any unclaimed winnings attached to them are forfeited without recourse. Check the expiry date the moment you claim; it's usually in the first line of the offer terms.
The honest summary: 100 free spins no deposit exists in the UK market in 2026, but it's a smaller, cleaner, more transparent product than the banner ads of three years ago suggested, and the operators delivering the best genuine value are the ones publishing the least dramatic numbers.