Place flour, bicarbonate of soda, salt and sugar into a bowl. Mix well, make a well in the center.
Pour in the melted butter and the buttermilk, combine all ingredients. The dough should be fairly moist.
Put some flour on your hands, remove the dough from the bowl and place on a floured surface, fold the dough from the outside edges in a couple of times (do not over knead). Shape into a round loaf.
Dust a wooden spoon with flour, Make a deep cut with the wooden spoon in the bread in a cross shape. Place bread on a floured baking tray, sprinkle with a little flour and bake in a pre-heated oven for 30 min. It should sound hollow when tapped.