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A Double Mattress UK Is Ideal For Couples The double mattress is the most popular UK bed size. The double mattress is great for couples, and it suits many homes. The UK offers many bed sizes including single, small double and double, king and super King. King and super King size beds are ideal for those who require plenty of space. Comfort A double mattress is ideal for couples who want to share a space for sleep that allows them to stretch out. It's also the most sought-after size of mat