Week six of The Great British Bake Off is pastry week. Judges Prue Leith and Paul Hollywood have put together three tough challenges that will really test the remaining seven bakers' prowess with pastry. There's a savoury signature, where they must impress with style and substance; a multi-layered technical; and an ambitious final challenge, in which the bakers are pushed to the edge with a traditional pie. Sandi Toksvig and Noel Fielding are with the bakers every step of the way, ready with a pertinent pep talk, a helpful hand or just a sympathetic shoulder to cry on. Also, Sandi heads abroad to discover how some unusual habits have inspired a classic pastry treat.