The welcome package is the largest single offer on the site and the one most new players will meet first. It pairs a 350% match up to £12,000 with 350 free spins on Big Bass Splash, and — because it is a UK offer launched after 19 January 2026 — it carries only 10x wagering. This page walks through how the match works, how to claim it, what different deposits actually return and the terms that matter.
What the Welcome Package Includes
The offer has two parts, both triggered by the first deposit:
- A 350% deposit match. Every £1 deposited earns £3.50 in bonus funds, up to a ceiling of £12,000. The minimum deposit is £20.
- 350 free spins on Big Bass Splash. These arrive as 35 spins per day for ten days, valued at 10p each. That is £35 of total spin value, spread out rather than handed over in one go.
The bonus is valid for 30 days. Each day’s batch of spins expires 24 hours after it is credited, so the spin element suits players who log in regularly. Only one welcome bonus is available per person or household.
How to Claim It
- Register an account at DieselWin and complete the age and identity check. This happens before any deposit can be made — it is a UK requirement, not an optional step.
- Set your deposit limits when prompted during registration. They can be lowered at any time later.
- Open the cashier and select the welcome bonus. The opt-in is essential; the bonus will not be added retrospectively.
- Deposit £20 or more with a debit card, e-wallet, open banking or another accepted method. Credit cards are not accepted.
- Check your balance. The bonus funds appear straight away, and the first 35 free spins on Big Bass Splash are credited for that day.
- Log in daily for the next nine days to collect and use each new batch of spins before it expires.
Worked Examples
The match is simple multiplication until the cap kicks in. Here is what typical deposits return:
| Deposit | Bonus (350%) | Starting balance | Wagering (10x bonus) |
|---|---|---|---|
| £20 | £70 | £90 | £700 |
| £100 | £350 | £450 | £3,500 |
| £1,000 | £3,500 | £4,500 | £35,000 |
| £3,430 | £12,000 (cap) | £15,430 | £120,000 |
The cap is reached at £3,430: multiplying by 3.5 gives £12,005, which is trimmed to £12,000. Depositing more than that adds to the cash balance but not to the bonus.
The wagering column is worth a second look. The bigger the bonus, the more play it takes to convert. A £70 bonus needs £700 of slot spins; the maximum bonus needs £120,000. For most players a deposit in the £20–£100 range is the realistic choice.
Wagering Explained
Wagering is the amount you must stake before bonus funds become withdrawable cash. Here it is set at 10x the bonus amount — not the deposit plus bonus — which is the maximum UK operators may apply since 19 January 2026.
Take the £100 deposit example. The bonus is £350, so the requirement is 10 × £350 = £3,500. At £1 a spin on a slot, that is 3,500 spins. Free-spin winnings work the same way: if the 350 spins return £20, that £20 needs £200 of play.
The maximum bet while wagering is £2 per spin. Exceeding it can void the bonus and any winnings made from it. Everything must be completed inside the 30-day validity window.
Which Games Count
Game contribution decides how quickly each stake clears the requirement:
- Slots — 100%. A £1 spin clears £1. Titles such as Sugar Rush 1000, Book of Ra, Le Zeus and Big Bass Splash itself all count in full.
- Live casino and table games — 10%. A £1 hand of blackjack or a £1 roulette bet clears just 10p.
Bonus buys and feature buys are not available to British players, so every spin is a standard spin. UK rules also cap slot stakes at £5 per spin (£2 for players aged 18–24), enforce a minimum five-second spin, and do not allow autoplay or turbo modes.
Key Terms at a Glance
- Minimum deposit: £20.
- Match: 350% up to £12,000.
- Free spins: 350 on Big Bass Splash, 35 a day for 10 days, 10p each.
- Wagering: 10x the bonus; 10x free-spin winnings.
- Maximum bet while wagering: £2 per spin.
- Validity: 30 days; each spin batch expires after 24 hours.
- Opt-in required at the cashier; one bonus per person or household.
The full conditions are set out in the terms and conditions. Withdrawals of converted funds follow the normal withdrawal process, including the verification checks.
Is the Welcome Package Worth It?
On paper, 350% is one of the larger match rates a British player will come across, and the £12,000 ceiling is far beyond what most people will ever deposit. Those headline figures matter less than two quieter details: the 10x wagering and the spread of the free spins.
Ten times the bonus is the highest multiple UK law allows, and there is no fine print hiding a heavier requirement. A £20 deposit leaves a £700 target, which a slot player staking 50p a spin covers in 1,400 spins — a realistic amount over a month. Compare that with the pre-2026 market, where a similar bonus would often have needed several times as much play.
The free spins are less flexible. Splitting 350 spins into ten daily batches of 35 rewards regular log-ins and penalises anyone who plays once a week, since unused batches expire after 24 hours. If you only play occasionally, value the offer mainly on the match.
The verdict from our review: for a modest first deposit, the package is generous and transparent. The upper end of the range is there for high-stakes players and needs to be judged against a budget, not against the size of the cap. Use the withdrawal guide to check limits — £5,000 per day and £25,000 per month as standard — before chasing a large conversion.
Play Within Your Limits
A large match percentage can make a big deposit look tempting. It is worth resisting that pull. Decide on a budget first, then pick the deposit that fits it — the bonus will scale accordingly. Use the deposit limits set at registration, take breaks, and stop if play stops being enjoyable. Free, confidential support is available from BeGambleAware, GamCare on 0808 8020 133 and the GAMSTOP self-exclusion scheme. The site is 18+ only.
Ready to start? Open an account and claim 350% up to £12,000 + 350 free spins. 18+, new UK players only, 10x wagering, T&Cs apply.
Once the welcome package is used, the ongoing offers take over: the Tuesday Wallet Boost, the Weekend Reload and the no-wagering weekly cashback. See every offer side by side on the promotions hub.
