Place the mixed fruit, sugar, spice, water and butter in a large saucepan and bring to the boil. Simmer gently for 3 minutes, then remove and allow to cool. Add the sherry, eggs and marmalade. Fold in the sifted ingredients mixing well. Place mixture in a greased and lined 20cm round cake pan. For a crunchy topped cake, sprinkle over the muesli and docorate with a few walnuts and cherries before baking, Bake in a moderatley slow oven for 2 1/4 hours or until cooked when tested. (N.B. cover loosely with a sheet of foil or brown paper if top of cake os overbrowinging during cooking).