Preheat the oven to Gas Mark 4 (180°C) and line a tray bake pan with parchment paper.
Mix the oil and sugar together and then stir in the vanilla extract and milk.
Mix the flour, baking powder & bicarbonate soda in a separate dish.
Use a whisk to combine the dry ingredients with the wet.
Pour the batter in to the pan and bake for 20 minutes or until a cake skewer comes out clean.
Place on a cooling rack to cool down completely before icing.
For the icing simply mix the icing sugar with the berry juice until it forms a thick consistency.
Spread the icing on top of the cake and allow to set before serving.
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