Prepare the Bowl: Line a medium metal bowl with cling film, allowing some overhang for easy removal later.

Chop the Ingredients: Finely chop the milk chocolate, dark chocolate, and all your mix-ins like biscuits, marshmallows, and cherries.

Melt the Chocolate Mixture: In a saucepan over low heat, melt the unsalted butter and golden syrup until bubbling, then add the chopped chocolates and stir until smooth.

Combine the Mixtures: Pour the chocolate mixture over the chopped ingredients in the large bowl and gently fold everything together.

Set the Pudding: Transfer the mixture into the prepared bowl, smoothing the top and refrigerate for about 2-3 hours.

Decorate the Pudding: Once set, melt the white chocolate and pour over the pudding, then decorate with buttercream and M&Ms.