Preheat oven to 220°C (425°F). Line a baking sheet with parchment paper.
In a large bowl, add the self-rising flour and cold butter. Use a pastry cutter or your hands to mix until the texture resembles coarse crumbs.
Pour in the cold milk and gently mix until just combined. Do not overmix.
Transfer the dough to a floured surface and gently knead 2-3 times. Flatten to about 2 cm (3/4 inch) thickness.
Use a round cutter to cut biscuits and place them on the baking sheet.
Bake for 12-15 minutes, or until the tops are golden brown.
Let cool for 5 minutes before serving. Enjoy warm with butter or jam!