Phil and Christine tackle a puzzling bake as they attempt a giant jigsaw, formed by nine interlocking cakes. Suzanne goes off kilter with a wonky castle cake that's fit for a king, including six kilos of stone effect fondant and 10 edible turrets. Former tattoo artist Ben Cullen battles to keep his tractor birthday cake on the road. At nearly two feet wide, the cake even includes two LED headlights.