This works in tandem with the £5 Welcome Offer. Once you decide to bet the real cash, the casino will matchup your first deposit by 100%. The funds will be credited to your bonus account within the next 10 minutes. Note that this promotion is capped at £100. This means that if you spend £500 to fund your account balance, you will only get a maximum of £100 cash from the operator.
You can only avail of this offer once. And this is only available once per household. The casino can trace your IP address and has the right to suspend or cancel your account if you violate this.
The minimum deposit required to claim the 100% matchup is £3. You can withdraw your winnings but you must deplete your bonus cash before doing so. Otherwise, the casino will remove any remaining bonus amount from your balance. However, the casino will not void the original deposit you made.