Pre-heat the oven to 170C / Gas Mark 4. Beat the butter and sugars together until light and fluffy.
Beat in the eggs one at a time add the vanilla extract and lemon zest mix in well.
Fold in the flour and carefully mix in the blueberries.
Divide the mixture between the 3 cake tins and bake at 170C / Gas Mark 4 for 20 mins.
Cool and beat butter lemon juice and icing sugar together, blend in the cream cheese last.
Decorate each layer of the cake with a thin layer of the frosting and then cover the whole cake with the remainder. Finish off with the blackberries and blueberries and edible flowers.