Preheat the oven: Heat the oven to 200°C, 180°C fan, or Gas Mark 6. Line a baking tray with baking paper.
Mix the dry ingredients: Add the flour, bicarbonate of soda, and salt to a large bowl. Mix well so the bicarbonate of soda is evenly distributed.
Add the buttermilk: Make a well in the centre and gradually pour in the buttermilk. Mix gently until a soft, slightly sticky dough forms.
Keep the dough light: Do not knead the dough like yeast bread. Stop mixing as soon as the ingredients come together.
Shape the loaf: Turn the dough onto a lightly floured surface and gently shape it into a round loaf.
Score the top: Transfer the loaf to the baking tray and cut a deep cross across the top with a sharp knife.
Bake the bread: Bake for 30–40 minutes, or until the crust is golden and the bottom sounds hollow when tapped.
Cool before slicing: Place the loaf on a wire rack and let it cool for at least 10–15 minutes before slicing.