Pre-heat oven to 425F/220C. Line a baking sheet and set aside.
In a bowl, whisk together flour, baking powder, baking soda and salt. Cut the butter into the flour mixture with a pastry cutter or a fork till it resembles coarse crumbs.
Add the buttermilk and use a spatula to combine till a rough dough forms.
Turn the dough out on a floured work bench and pat it into a rectangle. Fold the rectangle into thirds.
Give it a half turn, pat it back into a rectangle, fold it into thirds and repeat this once more.
Roll the dough out into 1/2 inch thickness. Cut 10-12 biscuits. While cutting the biscuits, don't rotate the cookie cutter.
Transfer the biscuits onto the lined baking sheet. Brush with buttermilk and bake for 15 minutes till the top is golden brown. Serve warm.