Sifted flour, sugar, baking powder, salt, and baking soda into a large bowl. Cut in butter until mixture is crumbly. Add egg, orange peel and orange juice all at once, stir just until mixture is even, just until moist. Fold in raisins and cranberries. Spoon into a greased 9x5x3 inch loaf pan. Bake at 350 degrees for 1 hour and 10 minutes or until toothpick comes out clean. Remove from pan, cool on wire rack.