You will need 2 x 8 inch cake tins. Sieve the flour and bicarbonate of soda together in a large bowl. Place the dark chocolate in a microwave safe bowl and microwave, for 30 seconds or until melted. Add the oil, water, Carnation® Light Condensed Milk, eggs and 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 mix till smooth.