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.

Cake maker Karisha heads to Blenheim Palace to attempt her tallest wedding cake yet - a towering 10-foot crystal masterpiece. Formed from one large vanilla cake at its base, and three fondant covered dummy tiers, it will include thousands of LED-lit crystals and hundreds of fresh flowers. Rosie's in her element with a playful bouncy castle cake. Measuring two-foot wide, this bouncy castle is wrapped in 15 kilos of fondant, and includes 10 gravity defying sugar paste children. And Eloise faces double trouble with a London double-decker bus birthday cake wrapped in red fondant.