1.Combine prunes, sultanas and currants in large bowl, stir in sherry and brandy. Cover tightly with plastic wrap, stand in a cool, dark place overnight or up to a week, stirring every day.
2.Preheat oven to 150°C (130°C fan-forced). Grease deep 22cm-round or deep 19cm-square cake pan, line base and side(s) of pan with four thicknesses of baking paper, extending paper 5cm above sides(s).
3.Beat butter and sugar in small bowl with electric mixer only until combined. Beat in eggs, one at a time.
4.Transfer mixture to large bowl, stir in the combined coffee and the water and jam, then the sifted dry ingredients in two batches. Drain prune mixture, reserve liquid. Stir prune mixture, cherries, dates, peel and nuts into cake mixture.
5.Spread mixture into pan. Bake about 2 hours.
6.Brush reserved prune liquid over hot cake, cover tightly with foil, cool cake in pan overnight.
Cake can be made up to three months ahead.Note