This first show uncovers that Queen Victoria is responsible for Britain's wedding cake tradition, that the Puritans tried to ban cake because it was too pleasurable, and that cake baking contributed to women's liberation.
It's the penultimate round and as the travelling marquee pitches up in the Cornish village of Mousehole, it's time for the bakers to get to grips with the most difficult of all baking skills - pastry. They bake their own versions of hearty British pies, get down to details with exquisite pastry canapés, and take a crash-course in crimping for this week's surprise bake.
It's the Grand Final and the last three surviving contestants face their biggest challenge yet - baking for the Bake Off's Afternoon Tea Party. In order to be crowned the victor, they will need to bring together all of their skills, making cakes, bread and pastry.