This deal from Wowcher
From £139 instead of £318 (from Emma) for an Emma Essential mattress – save up to 56%
Get an Emma Essential mattress – just the thing you need for a restful night’s sleep every night! Temperature Regulating: Two layers of breathable foam work away moisture to help you stay cool. Supportive: Designed to suit all body types, with unique cutouts that support shoulders and hips. Comfortable: Breathable foam is perfect for all sleepers, whether you sleep on your side, front or back. Removable & Washable Covers: Temperature-regulating top cover and bottom cover are washable at 40 degrees. Five Sizes: Single, small double, double, king or super king.