Golden Gaytime cake

Name: Golden Gaytime cake
Ingredients: 180 gram white chocolate, chopped coarsely; 150 gram unsalted butter, chopped; 1 1/4 cup (275g) caster (superfine) sugar; 1 cup (250ml) milk; 1 1/2 teaspoon vanilla extract; 2 eggs; 1 cup (150g) self-raising flour; 1 cup (150g) plain (all-purpose) flour; 30 gram sweet malt biscuits, crushed lightly; 30 gram unsalted roasted peanuts, chopped; assorted chocolates (see tips); gold and silver lustre powder, optional; 1/3 cup (80ml) milk, approximately; 1 1/2 cup (180g) malted milk powder; 400 gram unsalted butter, softened; 2 1/2 cup (400g) icing (confectioners') sugar; 80 gram dark (semi-sweet) chocolate, chopped coarsely; 1/3 cup (80ml) pouring cream