This deal from Wowcher
From £49 for a small single 3D quilted memory foam sprung mattress in small single, single, small double, double or king from Desire Beds
Mattress: Get a 3D quilted memory foam sprung mattress. Sizes: Choice between small single, single, small double, double and king. Cover: Micro quilted cool touch cover with a deep quilted top panel. Foam mould: Moulds to the shape of your body. Hypo allergenic filling: With anti-dust mite features. Head-to-toe anatomical support: Aims to relieve pressure points and promotes good blood circulation.