Sift the plain flour, salt, bicarbonate of soda and cream of tartar into a basin. Add the wholemeal flour and mix well. Cut the butter in pieces, add to the flour mixture and rub in. Add sufficient milk to the egg to make the liquid up to
Turn the dough out on to a floured working surface and knead lightly. Pat or roll out to a thickness no less than
Place the scones on a floured baking tray and dust with extra flour. Place above the centre in a hot oven (220°C., 425°F., Gas Mark 7) and bake for 10 minutes or until well risen.