The 'selfie' had to be constructed from layers of decorated biscuits and sandwiched together with fillings of your choice.

The portrait needed to be in a location that was memorable.

The hosts said "This showstopper is a fiendish test of the bakers' biscuit-making ability. Not only must they engineer a giant canvas, but they also need to make multiple intricate elements to bring their portraits to life.

Prue Leith: "This is the first opportunity the bakers have had to show us artistry, skill and imagination. We want the selfie to be built up with layers of biscuits because we want some depth to it. "

Paul Hollywood: "We want a proper portrait displayed on an easel, so obviously the biscuit sliding on the sloping canvas is a big problem. They could use caramel to stop the slide, or royal icing - those are the perfect things to bond the biscuit and withstand the force of gravity. "

Prue Leith: " Importantly, on The Great British Baking Show ™, we don't want style over substance. If these don't taste like the most beautiful biscuits you've ever eaten, then the bakers aren't going to get anywhere."