Preheat oven to 180 degrees C. Grease and flour one 20x30cm baking dish.
Sift the flour, bicarb soda, salt, ground cinnamon, nutmeg, cloves and allspice. Set aside.
Cream the copha with the white sugar. Blend in the eggs one at a time and beat well for 1 minute. Add the dry ingredients alternately with the prune juice. Stir in the prunes and nuts. Pour batter into the prepared pan.
Bake at 180 degrees C for 30 minutes or until done.