Ice Queen Cake

Name: Ice Queen Cake
Prep time: 1 h
Cook time: 4 h
Total time: 4 h
Yield: 20 slices
Ingredients: 300 g unsalted butter; 300 g caster sugar; 5 large eggs; 300 g self-raising flour; 1 tsp baking powder; 2 oranges; 30 g orange juice, freshly squeezed; 120 g unsalted butter; 120 g caster sugar; 2 large eggs; 120 g self-raising flour; ¼ tsp baking powder; 1 orange; 15 g orange juice, freshly squeezed; blue food colouring gel; 1000 g fondant icing; water; 300 g unsalted butter; 600 g icing sugar; 1 orange; 1 orange; 100 g blueberry jam; silver decorating balls; silver edible glitter