Preheat oven to 180 C. Lightly grease a baking tray and dust with a little cake flour.
Mix flours and baking powder in a mixing bowl. Beat egg, yoghurt and oil together.
Stir egg mixture into the flour until it just forms a soft dough.
Gently press dough out onto a lightly floured surface to about 2 cm thick. Take care not to handle the dough too much.
Cut out scones using a small cookie cutter or water glass. Dip the cutter or glass in extra flour if necessary.
Place scones on baking tray. The left-over dough can be pressed together and cut into more scones.
Bake for 15-20 minutes or until golden brown and cooked.
Serve with a thin layer of margarine and jam.
A pinch of cayenne pepper or paprika can be sprinkled on top for a savoury scone.