Preheat the oven to 200℃/190℃ Fan/gas mark 6. Lightly oil a baking sheet or line with baking parchment.
Place the flour, salt and bicarbonate of soda in a large mixing bowl and stir with a wooden spoon to combine.
Add the yogurt and mix to a soft sticky dough. Tip the dough out onto a lightly floured work surface and knead lightly, then shape into a ball.
Place on the baking sheet and flatten the ball with your hand, then score a deep cross into the dough almost but not quite cutting the dough into quarters. Dust liberally with flour.
Bake for 35 minutes or until the bread is risen and a golden brown.
Transfer to wire rack to cool. Best eaten on the day it is made.