Biscuit Crumble with Chocolate and Raspberries

Name: Biscuit Crumble with Chocolate and Raspberries
Ingredients: 1 cup sugar; 3 tablespoons cocoa powder; 1 heaping tablespoon all-purpose flour; 1 teaspoon vanilla; 1/8 teaspoon salt; 1/2 cup milk; 1 cup fresh raspberries; Biscuit scraps or whole biscuits, store-bought or homemade, recipe follows, for crumbling; 2 cups self-rising flour, sifted, plus more for flouring work surface; 1/4 cup cold coconut oil (refrigerate to solidify prior to measuring); 3/4 cup cold milk; Melted butter, for brushing