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Sizes of Mattresses in the UK A UK small double bed provides a larger sleeping surface than single beds, making it ideal for couples or sleepers who want to spread out in their bedrooms without taking up too much space. It's a popular choice for guest bedrooms and a compact master bedrooms. Online, you can also find US sizes, such as full queen, twin and king. However, the measurements are different and it's important to verify that your existing bed frame and furniture will fit the new mattress. Wh