Chocolate cake

Name: Chocolate cake
Prep time: 35 min
Cook time: 20 min
Total time: 55 min
Cuisine: European
Ingredients: 200g golden caster sugar; 200g unsalted butter (softened plus extra fo the tins; 4 large eggs; 200g self-raising flour; 2 tbsp cocoa powder; 1 tsp baking powder; ½ tsp vannila extract; 2 tbsp milk; 100g milk chocolate, chooped; 200g butter, softned; 400g icing sugar; 5 tbsp cocoa powder; 2 tsbp milk; 50g dark chocolate; 25g milk chocolate; 25g white chocolate