With Sandi Toksvig, Noel Fielding, Paul Hollywood, Prue Leith. 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 ...