Episode 7

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.