Pre-heat the oven to 180 degrees.
Grease and line a 30cm x 6cm x 10 cm loaf tin with greaseproof paper. Combine the water, sugar, butter, sultanas and currants in a large saucepan. Heat over a medium heat until the butter has melted and the sugar has dissolved. Remove from the heat, then add the flour, baking powder and spice after a few minutes. Stir well to combine thoroughly.
Pour into the prepared loaf tin. Bake for 30-40 minutes until a cake tester comes out clean when inserted into the centre of the loaf. Remove and allow to cool for a few minutes before turning out onto a wire rack to cool completely. Slice and serve.
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