Sieve the flour into a bowl and add the salt & baking powder. Combine well.
Rub the butter into the flour mixture until it resembles breadcrumbs.
Add the yogurt and mix gently with a spatula until it forms a soft dough.
Cool for an a hour if time allows.
Preheat the oven to 180°C.
Roll the dough out between two sheets of parchment paper to 2cm thickness, then stamp out round shapes, using a round cutter or mug.
Place the scones on a baking tray lined with baking paper.
Bake them for 10-12 minutes until risen and golden on top.
Serve them warm or at room temperature.