Air date: 2017-08-29

Runtime: 57 min

Cake Week sees the bakers take on a fruity challenge. Prue sets her first technical - a kids' party favourite. Plus, the trickiest showstopper ever set in the first week of Bake Off: an illusion cake.

Air date: 2017-09-05

Runtime: 57 min

It's week two, and the sandwich biscuit signature challenge sees bakers trying to blend biscuit and filling. There's a technical task set by Paul Hollywood that no one has tried before. And a final showstopper challenge that takes the biscuit and is literally game changing. Paul and Prue Leith cast a critical eye over the contestants' efforts, while new hosts Sandi Toksvig and Noel Fielding settle into their roles. As ever, it remains to be seen which of the unlucky bakers will be shown the door.

Air date: 2017-09-12

Runtime: 57 min

It's Bread Week and the ten remaining bakers have a lot to prove to Paul Hollywood and Prue Leith. This time they've been set three tough challenges: a teacake signature, where they must rise to the challenge; a two-tiered technical that's back to basics; and the most ambitious sculpture showstopper ever set in Bread Week. Only one can claim star baker; while another will leave the tent for good.

Air date: 2017-09-19

Runtime: 57 min

Nine bakers remain and for the first time it's caramel week. Prue Leith and Paul Hollywood have set the contestants three sticky challenges - a super sweet signature with a rich teatime favourite, a double Dutch technical, and a caramel showstopper. The three tasks will result in one star baker, while another will leave the tent for good. Sandi Toksvig and Noel Fielding lend a hand with pep talks and shoulders to cry on.

Air date: 2017-09-26

Runtime: 56 min

Prue and Paul are seeking perfection in pudding week, with a staggering technical challenge and a multi-layered showstopper that's not to be trifled with.

Air date: 2017-10-03

Runtime: 57 min

The bakers face a tough triple challenge including an ambitious traditional pie.

Air date: 2017-10-10

Runtime: 56 min

The bakers face a Sicilian signature, a deceptively tricky technical, and a fiddly showstopper in the hottest temperatures ever recorded in the tent.

Air date: 2017-10-17

Runtime: 57 min

The remaining five bakers step back in time for Forgotten Bakes Week, facing the test of baking with unfamiliar recipes, with places in the semi-final at stake. They start with a sweet and savoury signature challenge, before Prue Leith sets a boozy technical and, for their final challenge, the bakers must produce an elaborate sponge showstopper that once graced the dining tables of high society. Sandi Toksvig and Noel Fielding are on hand to help the bakers calm their nerves.

Air date: 2017-10-24

Runtime: 56 min

It's the semi-final, and the four remaining bakers must set to work on producing 24 exquisite choux buns. Prue Leith has set a complex technical for her first semi-final that leaves everyone stumped. And there's a meringue sculpture showstopper where the bakers mustn't crack under pressure. Noel Fielding and Sandi Toksvig present, while Paul Hollywood passes judgement alongside Prue.

Air date: 2017-10-31

Runtime: 56 min

Twelve bakers started, just three remain. Who will succeed with the demanding final challenges, including a high-end patisserie showstopper, to be crowned winner of The Great British Bake Off 2017?