Preheat the oven to 200°C and grease a baking sheet.
Sift the dry ingredients together and then add the sugar and mix.
Add the butter and rub the mixture with your fingertips until it resembles breadcrumbs.
Measure the milk in a measuring jug, add the egg and mix with a fork until combined.
Add all but about 25ml of the egg mixture to the flour mixture. Reserve the 25ml of egg mixture to glaze the scones before baking.
Mix everything with a fork until all the dry ingredients have been combined.
The dough should be very soft, but not too sticky. Add a tablespoon of flour if the dough is still very wet.
Flour your hands and the surface you will be working on and turn the dough out.
Softly roll the dough out to 15mm thick.
Cut scones using a floured round cookie cutter or a drinking glass.
Place the scones on the baking sheet just touching each other.
Combine the offcuts of dough, roll out to 15mm again and cut more scones. The recipe makes about 12, depending on the size you make them.
Glaze the top of the scones with the remaining egg mixture using a pastry brush.
Bake for 12 - 15 minutes until the scones are pale brown on top. Serve with your choice of topping.