Royal Chocolate Biscuit Cake Recipe serves about 8 7 oz. McVities digestive biscuits (about 12 biscuits). See above for substitutions. 6 oz. semi-sweet chocolate (milk chocolate)* 2 oz. dark chocolate (60% cocoa)* 4 tablespoons butter 2 tablespoons milk 4 tablespoons sugar or honey
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."