Heat the oven to 230°C. Put a baking tray onto the middle rack of the oven.

Sift both flours, salt and bicarbonate of soda into a large bowl, then mix together. Make a well in the centre and pour in the buttermilk. Stir the dough together until no pockets of flour remain.

Spoon onto a large piece of baking parchment. Using wet hands, gently pat into a uniform round. Scatter the oats on top and gently pat them all over the loaf.

Transfer the dough to the preheated tray. Bake for 45-50 mins until golden brown all over. Allow to cool for at least 30 mins, until just warm, before slicing into it.