Combine flour, sugar, baking powder, soda, salt and buttermilk powder. Mix. Cut in margarine. Add water, raisins and orange peel. Mix only until dry ingredients are moistened. Gather dough into a ball and turn out onto floured board. Knead lightly 12 times and divide into two equal parts. Pat into circles approximately 1/2 inch thick. Brush with glaze and cut each circle into 8 wedges. Place wedges 1" apart on ungreased cookie sheet and bake at 425 about 13 minutes or until tops are brown.