Grease and line a 2lb loaf tin. Preheat the oven to 180℃/160℃fan/Gas 4.
Put the dates in a bowl, pour over the measured water and leave for 15 minutes.
Combine the butter, sugar, egg, flour and baking powder in a large bowl and beat until blended. Add the walnuts and dates, plus the soaking liquid and stir.
Transfer to the tin and bake for 1¼ - 1½ hours.
Leave to cool in the tin for 5 minutes, then turn out onto a wire rack. Peel off the baking paper and leave to cool completely.
Serve sliced with butter.
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