Preheat oven to 375. Combine flour, sugar, baking powder and baking soda. Add butter; mix with fingers or fork to form fine crumbs. Stir in currants. Make well, and pour in buttermilk. Stir with fork until dough holds together.
Pat dough into a ball and knead lightly 5 or 6 turns on lightly floured surface. Shape into smooth ball and place on greased pan. Sprinkle with cinnamon sugar mix.
Bake for 10 minutes then cut a cross on the tip 1/2" deep. Bake another 20 minutes or until golden. Serve warm.