Chocolate orange & cranberry red velvet bombe

Name: Chocolate orange & cranberry red velvet bombe
Prep time: 1 h 10 min
Cook time: 45 min
Total time: 1 h 55 min
Cuisine: British
Ingredients: 175g butter , very soft, plus extra for greasing; 200g plain flour , plus extra for dusting; 200g golden caster sugar; 4 large eggs; 2 tbsp cocoa; 1 tsp bicarbonate of soda; 1 ½ tsp baking powder; 75g buttermilk; 2 tsp vanilla extract; 2 x 10g tubes red food colouring (make sure it’s a bake-safe variety – we used Dr. Oetker); 2 tbsp white wine vinegar; 450ml double cream; zest 2 oranges; 100g bar white chocolate , finely chopped; 100g bar dark chocolate , finely chopped; 200g bar milk chocolate , finely chopped; 180g tub cream cheese; 3 tbsp icing sugar; 50g dried cranberries , plus extra to serve; sprinkles and edible glitter (optional), to decorate