Christmas pudding tiffin

Name: Christmas pudding tiffin
Ingredients: 100g/3½oz dried fruit (such as chopped glacé cherries, mixed peel and sultanas); 50ml/2fl oz whisky (or brandy or orange juice); 150g/5½oz unsalted butter, plus extra to grease; ½ tsp fine sea salt; 50g/1¾oz light brown soft sugar; 3 tbsp golden syrup; 3 tbsp cocoa powder; 200g/7oz dark chocolate, roughly chopped; 200g/7oz ginger biscuits, roughly crushed; 2 oranges, zest only; 200g/7oz dark chocolate, broken into pieces; 50g/1¾oz white chocolate, broken into pieces; edible gold star sprinkles (optional); edible gold lustre (optional)