Buy King Size Mattresses from Bed SOS the leading stockist of King Size mattresses. Our 5ft King Size Mattresses are available in various styles and prices points. We also have a wide selection of king size mattresseses and memory foam mattresses. All our King Size Mattresses comply with UK safety regulations and come with the necessary manufacturer’s warranty. As all our Mattresses are in stock in the UK we can offer free next working day delivery on all our 5ft King Size Mattresses. Our King Size Mattresses arrive carefully packed and fit any standard King Size bed.