Thanks To Anne for the recipe for chocolate mud cake. I have pasted it here so that I can attempt to cook it today!
WHITE CHOCOLATE CAKE
250 grams (8.8 oz) of butter
150grams (5.3 oz) of white chocolate chopped coarsely
2 cups of caster sugar
1 cup of milk
1 ½ cups of plain flour
1 tsp of vanilla essence
2 eggs lightly beaten

Grease a rectangular tin 16.5 x 26cm ( 6 1/2 x 10 2/5 inches.) I lined the base only and greased the sides. Set the oven heat at this point. Combine butter, chocolate, sugar and milk in medium saucepan, stir over low heat, without boiling, until smooth. Transfer mixture to large bowl allowing the mixture to cool for 15 minutes. Whisk sifted flour into mixture then stir in essence and eggs. Pour mixture into prepared tin. Bake in oven 180 degrees Celsius (356 Fahrenheit) for 50 -60 mins.

VANILLA ICING

2 Cups of confectioner's sugar (icing sugar) sift before measuring
1 ½ tablespoons butter, soft
½ teaspoon vanilla extract
3 to 4 tablespoons of milk (or add only enough to create desired thickness)

Mix and beat on the ingredients together until smooth and soft.

I made a double recipe of icing for this cake.