Earn 10% cashback on your next purchase at Burger King, max reward £30. Offer expires 22.02.2018 and is valid one time only. Burger King's majestic menu offers firm favourite for everyone. Whether it's a classic flame grilled Whopper, a tender and juicy Chicken Royale, or a Double Bacon Cheeseburger with their famous fries. To cool down, you can have a creamy Oreo Milkshake.