Noel Fielding and Sandi Toksvig introduce a special round of the baking challenge in which contestants must create confectionery inspired by the Roaring Twenties. The signature challenge involves a decorative twist on custard pies, while the technical round will be a test of the bakers' timing and consistency. Finally, for the Shows, they must create a three-tiered masterpiece inspired by their tipple of choice. Paul Hollywood and Prue Leith are on hand to assess the results of their efforts and decide who will be leaving the tent.