Alphabet cupcakes

Name: Alphabet cupcakes
Prep time: 1 h
Cook time: 25 h 30 min
Total time: 25 h 30 min
Yield: 24 portions
Ingredients: 250 g unsalted butter; 250 g water; 50 g Dutch cocoa powder; 150 g buttermilk; 2 eggs; 1 tsp natural vanilla extract; 300 g plain flour; 1 pinch salt; 300 g white sugar; 1 tsp bicarbonate of soda; 500 g icing sugar; 40 g Dutch cocoa powder; 240 g unsalted butter; 1 tbsp boiling water; 1 tsp natural vanilla extract; 40 g water; 3 tsp gelatine powder; 100 g glucose syrup; 15 g glycerine; 620 g icing sugar; natural food colouring of choice; 1 ½ tsp tylose; sugar glue