Ivory Sleep. The Ivory Sleep from Slumberland is a British made mattress, with a reassuring 5 year guarrantee. A set of medium-firm dual response open coil springs provide excellent overnight support, with a soft-touch pillow quilt topping adding a luxury touch. This mattress is bedstead friendly, and is also a no turn design - regular rotation is recommended to help maintain the quality of the mattress. And buy this Ivory Sleep Was £249.00 Now £229.00.