Melt together the butter, chocolate, and golden syrup in a bowl over a saucepan of simmering water.

Meanwhile break the digestive biscuits into bite size pieces and place in a large bowl together with the marshmallows, raisins and 120 g of the Crunchie Bits. Pour over the melted chocolate mixture and stir until all the ingredients are well coated.

Spoon mounds of the rocky road mixture onto baking sheets lined with non stick baking paper. Randomly sprinkle the remaining 20 g of Crunchie Bits over the mounds. Refrigerate for at least 2 hours before serving.