This deal from Wowcher
From £20 instead of £30 for a 13.5 gauge open coil spring mattress in small single, single, small double, double or king from UKFurniture4u – save up to 33%
Spring mattress: Get an open coil spring mattress. Open coil: The 13.5 gauge open coil spring system provides support for your body weight while you sleep. Five sizes: Choose between small single, single, small double, double or king. Damask cover: With a high-quality, soft top comfort layer. Medium to soft firmness: Perfect for those who sleep on their side!