In a medium bowl, combine the sliced strawberries with sugar. Cover and refrigerate. Whip cream with icing sugar, set aside.
Cream together the butter and sugar. In another bowl mix remaining dry ingredients, then add into butter mixture alternating with buttermilk.
Drop batter onto a greased baking sheet, form gently into scones shapes.
For glaze, whisk egg and cream. Brush scones with the mixture, then sprinkle over with sugar. Bake at 400°F for 15 to 18 minutes, or until lightly browned.
To assemble, split scones and spoon strawberries over the bottom. Put the top of the scone on the strawberries and top with whipped cream and a few strawberry slices.