Prewetts biscuits Half Coated Digestives 155g. Free from gluten & wheat Suitable for vegetarians Delicious gluten free digestive biscuits half coated in milk chocolate, made for the whole family to enjoy. Since 1872, when William Prewett began milling flour in Horsham, Sussex, the Prewett's name has been synonymous with fantastic quality foods. Our biscuits are simply delicious &, amazingly, they're Gluten Free!