Amazon.co.uk has Shining Miracle Gel Cushion Seat for £7.50
A.High-Tech:Gel Seat Cushion is made durable Hyper-Elastic Gel Polymer construction,Hypoallergenic for long hours use as office chair seat Gel mat ,car gel cushion , wheelchair soft gel seat ,plane Gel seat,Gel material seat are designed for couch cushion as get mat seat,as sofa Gel mat, office chair gel pad, car gel pad. folks that need to sitting for long hours.
B.Pain Relieving ：The coccyx Gel cushion for the spine and buttock by shifting the tailbone when sitting and aligning the spine, Special made Gel Mat tailbone cushion relieft the pressue of exceptional lumbar support for the treatment of coccyx injury, sciatica,hemorrhoids and pressure sores
C.ADVANTAGE: Unlike Ordinary other Car Seat Cushion ,Due to the special nature of the gel material, we made a layer of white cloth behind the gel seat cushion to fix the shape of the gel seat cushion so that it does not deform and last longer
D.EASY TO WASH:Removable and pro, washable cover has a durable zipper and a handle so you can carry your Gel Seat Cushion easily,Cotton-polyester blend does not attract lint. gel dotted surface ensures the set rest does not slip off the chair.
E:SUITABLE SEASON: summer,winter,spring, autumn “EASY TO CLEARN : The Gel Mat with a easily unzip the back of the seat and take off the Gel Pad back cushion cover and toss it into the wash. Machine-wash with cold water. Dryer safe.