Preheat the oven to 180°C/Gas 4.

Sieve the flour and bicarbonate of soda together in a large bowl. Place the dark chocolate in a microwave safe bowl and heat for 30 secs or until melted. Add the oil,water, carnation light condensed milk, eggs, vanilla to the melted chocolate and stir until smooth.

Make a well in the middle of the flour and then pour in half the chocolate mix. Stir well, then add the other half and then mix until smooth.

Pour in the mixture into 2 prepared 8 inch cake tin and bake for 25 mins or until a skewer in the centre comes out clean.

Chill completely. Sandwich the cakes together with the carnation chocolate filling and topping then use the remainder to cover.