My wife bought this instore at Tesco Ely. They seemed to have lots of stock.
I have photo of Tesco receipt but I do know how to upload it.
This lightweight highback booster seat with side impact cushion technology is ergonomically designed for older children. The adjustable headrest has multiple height positions and can be easily adjusted as your child grows. Your child is secured with the 3-point seat belt which is correctly positioned over your child’s pelvis and shoulder. Features on the product include side Impact Protection with deep, softly padded side wings, seat shape correctly positions lap belt over the child’s pelvis, seat belt guide correctly positions diagonal belt over the child’s shoulder, easily accessible seat belt path, height adjustable headrest helps support a sleeping child, adjustable backrest for safe installation in a wide range of cars, pull out drink holder and snack tray, lightweight shell for easy transfer between cars and a softly padded, washable cover.