Preheat the oven to 200C. (400F)
Place the flour, sugar and salt in a bowl and stir to combine.
Cut the butter into small pieces and rub it into the flour with your fingertips until it resembles fine breadcrumbs.
Pour the buttermilk in, and stir together with a butter knife or pallet knife until the dough comes together.
Tip onto a lightly floured surface and press the dough into a rectangle of about 4 centimetres thickness.
Cut into four squares using a sharp knife. Press straight up and down and don't use a back-and-forth sawing motion.
Place the squares onto a baking tray lined with baking paper, with a couple of centimetres space in between.
Brush the tops with milk if desired.
Bake for 15-20 minutes, or until golden brown and cooked through.
Allow to cool slightly and serve with jam and cream.
