For the flags
Glue the scraps of ribbon and paper on to the cocktail sticks. To make the bunting, cut out paper triangles and glue them on to the ribbon.
To make the Victoria Sponge
Preheat the oven to 180c/ fan 170 / 350/ gas mark 4 Take 2 x 20 cm sandwich tins. Butter the tins, and then line the bases with baking parchment. Line the sides with a 7cm high collar of baking parchment as well, to allow for the rise. For this batter, I use an electric mixer and beater attachment, but use a food processor, or a bowl and an electric whisk, if you want.
Sift the flour and the baking powder into the bowl, then add the butter (in knobs), the eggs, sugar and vanilla. Beat together until thoroughly blended, taking care not to over-mix, so you will have a light sponge. Scrape the batter into the tins and level the top.
Bake for 30-35 minutes, until the cake springs back to the touch or a skewer inserted into the centre comes out clean.
Remove from the oven and leave for a couple of minutes, then run a knife around the rim to loosen the cake from the tin and turn out on to a wire rack. Peel off the paper and leave until completely cold.
To make the coloured buttercreams
To make the coloured buttercreams. In an electric mixer, beat the butter until really pale and fluffy, then add the icing sugar and beat for at least 5 minutes, until light and creamy.
Divide the buttercream equally between 4 bowls. Make the raspberry puree by gently warming the fruits in a small saucepan, crushing with a fork, then sieving to remove the pips. Allow to cool. Make the blueberry puree in the same way, adding 1 tbsp water to the pan. Add the raspberry puree to 1 bowl of buttercream, the blueberry puree to another and the lemon curd to the third. Finally add the lime zest and juice and a little green food colour to the last.
Take your Victoria sponges and split them horizontally. Spread a different buttercream between each of the 4layers, topping with the blueberry.
Place the cake on its stand. Arrange the flags and windmills over the top and attach the bunting to the stand with the sticky tape.