Lightly grease a 12 inch circle in the center of a baking sheet.
In large bowl mix the first 8 ingredients. Cut the butter into 1/2 inch cubes and sprinkle them on top of the flour mixture. WIth a pastry blender or knife work the flour into the butter until it resembles coarse crumbs.
In a small bowl combine the yogurt, egg and vanilla. Add the yogurt mixture to the flour mixture. Stir in the carrots, raisins and nuts. The dough at this point will be sticky. Spread the dough in the center of the greasewd baking sheet forming a 81/2 inch circle. With a serrated knife cut the dough into 8 wedges. I have a scone baking tin which a just dived the dough into the already divided wedges. This makes it much easier. Do not forget to grease the scone tin, if using this method.