Step 1: Preheat the Oven

1. Preheat your oven to 220°C (425°F).
2. Lightly dust a baking tray with flour or line it with baking parchment.

Step 2: Mix the Dry Ingredients

1. In a large mixing bowl, sift together the wholemeal flour, plain flour, bicarbonate of soda, and salt.
2. Stir to combine evenly.

Step 3: Add the Buttermilk

1. Make a well in the center of the dry ingredients and pour in the buttermilk.
2. Using a wooden spoon or your hands, mix the ingredients together until a soft dough forms. Be careful not to overmix—the dough should be slightly sticky but manageable.

Step 4: Shape the Dough

1. Turn the dough out onto a lightly floured surface and gently shape it into a round loaf.
2. Place the loaf on the prepared baking tray.

Step 5: Score the Top

1. Using a sharp knife, cut a deep cross on the top of the dough. This helps the bread bake evenly and allows it to expand while baking.

Step 6: Bake the Soda Bread

1. Place the loaf in the preheated oven and bake for 30-35 minutes, or until the bread is golden brown and sounds hollow when tapped on the bottom.
2. If the bread is browning too quickly, you can cover it loosely with foil during the last 10 minutes of baking.

Step 7: Cool and Serve

1. Once baked, transfer the loaf to a wire rack to cool completely.
2. Slice and serve with butter, cheese, or as an accompaniment to soups and stews.