Preheat oven to 425°F (220°C). Lightly grease a baking sheet.

In a large bowl, sift together flour and salt. Rub in butter lightly with fingertips until mixture resembles coarse breadcrumbs. Stir in cheese and garlic. Make a well in the center of the mixture and pour in milk, reserving 1 teaspoon for glazing. Gently mix, just until combined.

Turn out onto a lightly floured board and knead briefly and lightly. Press out dough to form a 1-inch-thick round. Cut into 8 wedges. Place on the prepared tray and brush with reserved milk.