Adjustable back rest for bed/sofa (Kendal LA9)

I will give folk who do not get automatic & immediate freegle updates time to reply. These are a bit of a nuisance if you are not a dealer or carbooter & I will read all replies. Adjustable back rest for bed / lying on sofa or even the bath I think! Folds flat when not in use - see photo 3. Comes with instruction leaflet. In very good condition as barely used .