Close to McVitie's Digestive Biscuits on BigOven: "Traditional British biscuits, digestives can also be served buttered or with cheese. For a sweeter biscuit, brush one side with melted semisweet chocolate after baking."
I spent a summer in the UK a few years back and practically lived off McVities Digestive Biscuits. Cheap and easy to find in the UK, fairly expensive and hard to find in the US, so I decided to make them myself. I was not able to find a recipe that tasted enough like them, so I made my own recipe. They have been really popular with other McVitie lovers. Hope you like them, too!