It's week 4 in the tent, and the bakers are tackling a rich new theme: dairy. All week I've been excited to see what challenges Prue and Paul have in store for our bakers. Will we see any of our favorite crèmes (brûlée, patissiere, anglaise)? Will we see custards? Would they be so bold as to assign the bakers a challenge having to do with ice cream, knowing full well that Iain's series 5 bingate is still very much an international open wound? But even more importantly, as we hit the one-third mark on the season, will we start to see which bakers will be the cream that rises to the top, and which will start to sour? Signature challenge: Dairy cake Cake mixture must contain a cultured dairy product.