Heat oven to 220C,200C fan, gas 7 and grease a large baking sheet. Tip the flour into a large bowl and stir in the baking powder, sugar and 1/4 tsp salt. Rub the butter into the flour mixture with your finger tips until it is completly encorporated then stir in the buttermilk with the blade of a knife to make a soft dough.
Tip onto a lightly floured work surface and pat out with your hands until about 4-5cm thick. Stamp out rounds using a small, floured cutter then place the scones on the baking tray, spaced apart. Brush with milk, scatter with sugar and bake for 12 minutes until golden.
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