Preheat oven to 135 degrees C. Grease four loaf tins and then line with brown paper or foil. Grease again.
In a large container stir raisins, currants, fruit mix, glace cherries, maraschino cherries, dates and 1 cup flour together until all the fruit is well coated with flour.
Measure 2 1/4 cup flour, baking powder, bicarb soda, salt, cocoa, cinnamon and nutmeg into a medium bowl. Stir to mix.
In a very large bowl cream the butter with the sugar. Beat in egg yolks three at a time. Stir in pineapple with juice and vanilla. Add flour mixture in 3 parts alternately with fruit juice in 2 parts to the creamed mixture, beginning and ending with flour mixture. Stir in walnuts.
In another bowl beat egg whites until stiff. Fold egg whites into batter and stir in fruit gently. Divide batter among pans. Smooth.
Bake for about 3 hours until an inserted toothpick comes out clean.