If you have the floor space in your bedroom, then invest big with a super king mattress. Super king beds are the largest UK standard sized bed on the market. We have a limited selection of super king mattresses which measure 180cm x 200cm available at great prices. This is the nearest equivalent to what used to be known as the traditional 6ft size. Scroll to the foot of this page for more tips to help you ensure this is the right option for you. Mattresses featured here are included in our 100 night trial.