Preheat your oven to 220℃ (425℉)
Lightly dust a large baking tray with extra flour.
Add your 3 Cups self raising flour and ¼ tsp salt to a bowl.
Chop up the 75 grams cold butter into small pieces, toss them into the flour and rub the pieces into the flour by pressing them between your fingertips.
Do this until it resembles fine breadcrumbs.
Make a well in the centre. Add 1½ Cups milk and quickly mix to a soft dough using a knife.
Knead 2 to 3 times.
Push the dough down into a 2.5 cm (1 inch) high square.
Using a lightly floured knife to cut into 12 even size pieces, wiping off and flouring the knife with the extra flour between each cut.
Place the scones on the baking tray, nestling them up against one another.
Brush tops with a little extra milk, then bake for 12-15 minutes.
The scones are ready when they feel firm when squeezed in the middle.