Noel Fielding and Sandi Toksvig host as the remaining bakers' knowledge of pastry is tested. The Signature challenge is a savoury take on a French classic, there's a multi-layered Moroccan Technical, and a towering Showstopper that requires not only ... (more)an expertise with pastry, but also a solid grasp of structural engineering. With a place in the semi-final at stake, who will win the coveted Star Baker title from judges Prue Leith and Paul Hollywood?