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Heat the oven to 190c/gas 5.grease a 8in cake tin & line the base with greaseproff paper.
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Beat the sugar, butter & zest together until pale& fluffy.Gradually beat in the egg, a little at a time, beating the mixture well after each addition.Sift in the flour & baking powder, then gently fold into the butter mixture, along with the lemon juice.Pour the mixture into the cake tin & smooth the top.
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Bake for 40 minutes. A skewer in the centre shoudl come out clean when its ready,turn out on to a wire rack to cool.
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To make the icing, put the ingrediants in a bowl & beat until they are combined & spreadable.When the cake is cool, ice and decorate.