Preheat oven to 400°F.
Into a mixing bowl, sift the flour, baking powder, sugar, baking soda, and salt.
Grate the butter into the flour and cut the butter into the flour with a butter knife until it forms large crumbles.
In a separate bowl, whisk 1 egg into the buttermilk.
Make a well in the center of the flour and add the egg /buttermilk liquid.
Mix until the dough with a spoon until the dough comes together. It should be moist, but not be sticky. Add a touch more milk if it is too dry and not holding together.
Turn the dough onto a lightly floured surface.
Shape out to about 3/4 inch thick. Do not work the dough too much and do not use a rolling pin.
Using a non-fluted 2 1/2 inch cookie cutter, cut rounds. Dip the cutter into flour before each cut.
Line a baking sheet with parchment paper and place the rounds on the baking sheet, about 1/2 inch apart.
Whisk the remaining egg with 1 teaspoon buttermilk and brush the tops of the scones.
Bake for 15 minutes or until well risen and golden.
Remove from the oven and allow to cool completely on a wire rack covered with a towel to keep them moist.
Serve with clotted cream and strawberry jam.