Easy castle cake

Name: Easy castle cake
Prep time: 2 h
Cook time: 1 h 30 min
Total time: 3 h 30 min
Cuisine: European
Ingredients: 300g soft butter; 300g caster sugar; 6 eggs; 1 tbsp vanilla extract; 80g plain flour; 300g self-raising flour; 100g plain full-fat Greek yogurt; 3 tbsp milk; 8 tbsp seedless raspberry jam; 150g soft butter; 300g icing sugar, sieved; 600g ready-to-roll white icing; 200g ready-to-roll pink icing; 250g royal icing, made from a pack of royal icing sugar; 100g ready-to-roll lilac or light blue icing; 20 pieces chewing gum; 40 sugar cubes; silver balls; green food colouring; mini sugarblossoms; edible glitter; coloured cake board; wooden skewer; coloured sandwich flags or candles