With a place in the semi-finals at stake, the bakers are tested on their know-how in the Technical Challenge, where they will try to master Mary Berry's recipe for marble cake. They must then make a splash in the Showstopper Challenges as they rustle up and present a selection of impressive under-the-sea-themed biscuits.
| Name | Type | Role | |
|---|---|---|---|
| Aaron Craze | Host |