Pre heat the oven.Shift the Plain flour,baking powder,baking soda and add it in a large mixing bowl. Add in the milk,salt and sugar,mix well till the sugar dissolves completely. Add in the melted butter. Finally add the vinegar and mix well. Grease the pan and transfer the cake mix.Bake it at 180 degree Celsius for about 25-30 minutes. Once done remove it from the oven and cool down. Remove the grease paper and cool the cake completely before frosting.Mean while beat the whipping cream with icing sugar. Layer the cake into 2 and apply the frosting all over the cake. Pipe the sides and corners of the cake.