Rocky road Christmas pudding

Name: Rocky road Christmas pudding
Ingredients: 100g/3½oz self-raising flour; 1 level tsp bicarbonate of soda; 1½ tsp ground ginger; ½ tsp ground cinnamon; 50g/1¾oz golden caster sugar; 50g/1¾oz unsalted butter; 2 tbsp golden syrup; olive oil, for greasing; 100g/3½oz dark chocolate (70% cocoa solids), broken into pieces; 100g/3½oz good-quality milk chocolate, broken into pieces; 125g/4½oz unsalted butter; 75g/2½oz golden syrup; 50g/1¾oz marshmallows; 150g/5½oz biscuits, either the ginger biscuits (from above) or a mix of digestives and ginger biscuits; 75g/2½oz unsalted nuts, such as pistachios or toasted hazelnuts (see recipe tip); 75g/2½oz chocolate-covered honeycomb; 75g/2½oz glacé cherries or dried fruit; 50g/1¾oz good-quality white chocolate, to decorate; sprig of fake holly, to decorate (optional)