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Preheat the oven to 175ºC/350ºF.
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Grease a loaf pan and line with paper.
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Beat the room temperature butter and sugar until light and creamy.
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Add the room temperature eggs, one at a time -and then add the zest.
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Add the flour in two parts, half first then beat and then add the remainder with the citrus juice.
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Spoon the mixture into the prepared loaf pan and bake for 45-50mins or until a skewer inserted into the loaf comes away clean.
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FOR THE ICING
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Mix the icing sugar and juice together until it forms a smooth consistency and spoon it over the cooled loaf.
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Decorate with more zest if you like.