Warren Evans kingsize memory foam mattress for sale. Used for around six months. 

We haven't been happy with it and, depending on whether memory foam mattresses work for you, we may recommend this mattress as best for a spare room, rather than nightly use. 

Selling for £250 (or nearest offer); costs £1,270 new, though currently on sale with Warren Evans for £820). 

This is the description from the Warren Evans site: 

The Perfect Memory is a firm memory foam mattress which has no springs or traditional fillers. It is a heat sensitive material that morphs to the contours of your body, by using your own body heat. Memory foam gives under your heavier areas - yet remains firm under your lighter areas - where you have less contact with the mattress (waist, small of back, behind knees). This allows all your muscles, joints even your spine to be fully supported and able to relax and rest. This means you gently sink into our Perfect Memory mattress, softly cushioning your body and maximising support and comfort. What’s more, this type of mattress not only offsets your partner's movements throughout the night, it actually reduces the tossing and turning that can lead to disturbed sleep patterns, making it the ideal choice for anyone who suffers from joint and back pain.

Available immediately from Bayer House.