Sandi Toksvig enquires into questions and qualifications with Alan Davies, Ade Adepitan, Nish Kumar and Holly Walsh. 5/8
Sandi Toksvig embarks on the first part of her quest for knowledge with Alan Davies, Alan Carr, Alice Levine and Phill Jupitus. 6/8
Sandi Toksvig goes on the second part of QI's quest for knowledge with Susan Calman, Joe Lycett, Holly Walsh and Alan Davies. 7/8
Fiona and the team are at Dyffryn Gardens near Cardiff, where treasures include a ship's chest from the Empire Windrush, a clock that runs on air and a huge collection of Clarice Cliff. 12/20
It's Week 4 and the remaining sewers create zero-waste trousers, upcycle tote bags and repurpose crochet blankets in Reduce, Reuse and Recycle week. 4/10
It's Chocolate Week, and the bakers take on a tricky torte and a showstopping chocolate box. Who can smoothly make it through to the next week, and who'll have a meltdown? 4/10
The first of the semi-finals sees the contestants challenged to make choux buns, coffee eclairs, and savoury pastry tarts inspired by flags from around the world. 11/15
Four bakers demonstrate their technical skills by preparing a batch of chocolate chip cookies, and face an animal-themed invention challenge. 12/15
Frank and Lu find themselves puzzling through the world of enigmatology as they become podcasters investigating a twenty-year-old car accident that killed a young mother. 8/10
An apparently harmless group of treasure hunters arrive on the island looking for a legendary pirate's loot only for one of their number to be killed. 4/8
Sandi Toksvig finally gets round to a bit of procrastination with Aisling Bea, Holly Walsh, Nikki Bedi and Alan Davies. 12/16
Sandi Toksvig considers various phenomena with Alan Davies, Josh Widdicombe, Cariad Lloyd and Paul Sinha. 13/16
In Clapham, Masum and Maria's Victorian terraced home no longer works for their family. In Hove, Louis and Sarah tackle the upstairs of their 16th-century gatehouse. 4/5
Joanna heads towards the Danube Delta, one of the last great wilderness areas remaining in Europe, full of birdlife including the majestic Pelican. At the mouth of the river, on Romania's Black Sea coast, Joanna bids farewell to the Danube and reflects on her amazing journey. 4/4
Rick lands in the town that gave the world tequila and the metropolis that gave us mariachis and dishes like chilli con carne - Guadalajara. 4/7
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