Chocolate owl cake

Name: Chocolate owl cake
Prep time: 1 h
Cook time: 1 h
Total time: 2 h
Cuisine: British
Ingredients: 325g butter; 325g plain chocolate; 2 tsp vanilla extract; 325g plain flour; 1 tsp baking powder; 1 tsp bicarbonate of soda; 450g light soft brown sugar; 5 large eggs; 300ml soured cream; 250g butter; 350g icing sugar sieved; 50g cocoa sieved; 2 tbsp milk; 8 giant white chocolate buttons; 2 packs milk chocolate buttons; 2 chocolate Flake bars; 60g yellow marzipan; 125g pack chocolate finger biscuit; candles (optional); writing icing (optional)