Preheat the oven to 180ºC/350ºF/Gas mark 4

Grease a baking tray and set aside

In a large mixing bowl, sift together all the dry ingredients

Rub in the cubed butter and make a well in the centre

Pour in the buttermilk and mix until the dough just comes together

Tip the dough on to a lightly floured work surface and form it into a ball. Do not over-knead

Place the ball of dough on to the greased baking tray and bake for ¾ of an hour or until the top becomes golden brown

Allow to cool on a wire rack