Preheat oven to 180ºC (160ºC fan)

Cream main margarine and sugar, and add vanilla essence

Add eggs, then dry ingredients

Grease 7x11in tins and pour in the mixture

Put in oven and bake for 25-30 mins

Melt frosting margarine and boil for 2 mins

Combine quickly with icing sugar and cocoa

Add milk, mixing until soft enough to spread easily

Wait for cakes to cool before spreading the frosting, then cut into fingers