Combine the first 6 ingredients in a bowl, and cut in margarine with a pastry blender or 2 knives until mixture resembles fine meal. Add the raisins, and toss well. Combine buttermilk and egg, and add to dry ingredients, stirring just until dry ingredients are moistened (dough will be sticky). Spoon dough evenly into 5 mounds on a baking sheet coated with cooking spray. Bake at 190ºC or a 18 minutes or until golden. serve warm.