PICTURES: Bake Off (Episode 4)

It's Chocolate Week, and the competition starts to heat up as Prue and Paul set three tricky challenges to test the remaining bakers.

There's a deceptively simple traybake in the Signature, a Technical packed full of chocolate and nuts and a celebration Showstopper that pushes the bakers' skills with white chocolate to the limit. Who will impress Prue and Paul enough to keep their place in the tent and who will be heading home?

The Great British Bake Off continues Tuesdays at 8pm on Channel 4.