Sieve the flour, baking powder and baking soda into a large bowl. Then stir in the sugar and a pinch of salt. Rub the butter into the flour mixture using your finger tips until it resembles fine breadcrumbs. Gradually pour in a sufficient amount milk to make a soft dough.
Roll out the dough on a floured surface to a thickness of one centimeter. Cut into circles with a pastry cutter or an upturned glass. Brush the scones with the remaining milk and a sprinkle of sugar. Place the circles on a floured baking tray.
Bake in the pre-heated oven for ten minutes. Once baked, leave to cool on a wire rack.
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