Where To Stream The Great British Bake Off Season 4 Episode 4

It's week four in the tent and the baking is getting serious, as the remaining bakers put on their pinnies to pimp up pies and tarts. From the country's oldest known cookbook, we discover the almost 700 year old history of the English custard tart. As a technical challenge in the Bake Off tent, this classic sweet causes more than the intended wobble for the bakers!