Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt.
Add the cold, cubed butter to the flour mixture. Use a pastry cutter or your fingers to blend until the mixture resembles coarse crumbs.
Stir in the raisins until evenly distributed.
In a separate bowl, whisk together the milk, egg, and vanilla extract.
Pour the wet ingredients into the dry ingredients and mix gently until just combined. Do not overmix.
Turn the dough out onto a lightly floured surface and knead gently for about 1 minute until it comes together.
Pat the dough into a circle about 1 inch thick. Cut into wedges or use a round cutter to shape the scones.
Place the scones on the prepared baking sheet and brush the tops with a little milk for a golden finish.
Bake for 15-20 minutes, or until the scones are lightly golden on top.
Allow to cool slightly on a wire rack before serving.