The children have been bakers in the bakery at Pudding Lane. They worked in small groups to measure the ingredients in grams and ml to make their own bread rolls. The children then discovered that ovens weren’t the same in 1666 and used real fire to bake the bread, and in 1666 when all the bread had been baked for the day, one of the ovens hadn’t been extinguished properly, leading to the events of 1666.