Their welcome package consists of a £600 when you make your first deposit and an awesome 200 free spins. The nice thing about this welcome bonus is it’s valid for 21 days. When you join the Dunder Casino UK, you’ll be greeted with a nice dose of bonuses immediately. It looks like right now, the Dunder no deposit bonus is 20 free spins on Starburst. You don’t even have to make a deposit to benefit. They do offer a nice match bonus for registering and putting in your first deposit.