For the very first time on Bake Off, it's Vegan week. Prue and Paul have set three very different challenges to test the remaining bakers. A savoury pastry Signature, with no butter involved. A cracking Technical, with a very unusual ingredient. And finally, a spectacular Showstopper that, in the heat of the tent, threatens to lead to catastrophe. Who will keep their cool and win star baker? And who will be meeting their end?

It's the semi-final of the Great British Bake Off, and the remaining bakers are desperate to claim their place in the final. They know they are just three patisserie challenges away from the biggest day in their baking lives. First comes the Signature, and there's a deceptively simple challenge with Paul and Prue looking for perfection. The heat is on with Prue's complex, multi-layered Technical. And the semi-finalists feel the pressure when they're asked to create a spectacular Showstopper that could grace a Parisian patisserie. Who has the skill to reach the Bake Off final? And who will fall at the final hurdle?