Host: "For your signature challenge, the judges would like you to make Baked soda bread loaves. Now, you may flavour your soda breads any way you like, but one should be sweet and one should be savoury. Also, your loaves should be baked freeform rather than in a tin. And the judges would like you each to make a butter to go with your breads."

Paul Hollywood: "The thing is, with this challenge, it's only an hour and three quarters, so they haven't got to deal with yeast, but they've got to deal with the reaction between the rising agents and milk or buttermilk to create the growth in the loaf. 

Prue Leith: "We've asked our bakers to make two soda breads, one sweet and one savoury. Do you know, I'm expecting lots of cheese and lots of herbs and lots of nuts. It would be really nice to find somebody using something really different."