Preheat oven to 375°F. Line a large baking sheet or two standard size pans with parchment paper. Set aside.
Scones: In a large mixing bowl using a whisk sift together 2 1/4 cups flour, sugar, baking powder, salt and nutmeg. In a separate small bowl, toss blueberries with 1 teaspoon flour, set aside.
Using a pastry blender or 2 forks cut butter into dry ingredients until it resembles cornmeal. Add blueberries, fold into the flour mixture until evenly distributed. Make a well in the center.
Whisk together sour cream, heavy cream, egg, and vanilla in a small bowl. Gradually stir sour cream mixture into the dry ingredients until fully moistened.
Turn the dough out onto a lightly floured work surface. Turn the dough a few times to coat with flour to help with the stickiness. Do not overwork the dough. Pat the dough into an 8-inch circle that is about 1-inch thick.
Use a sharp knife (or pizza wheel) dipped in flour to cut dough into wedges. Transfer wedges to the sheet pan arranging at least 2-inches apart. Brush tops of the scones with heavy cream and sprinkle with turbinado sugar.
Bake for 22-25 minutes or until lightly golden brown. Remove from the pan to a wire rack.
Glaze: Mix together powdered sugar, cream and vanilla. Use additional heavy cream until desired consistency is reached. Drizzle glaze over warm scones just before serving.
Serve warm with fresh whipped cream and lemon curd or jam.