Gregg Wallace is in Nottingham at an enormous party food factory where they produce 200,000 canapes every 24 hours. Cherry Healey discovers fail-safe scientific methods for cooking the perfect turkey, then heads to a traditional candle makers in Wiltshire to learn the ancient technique of hand-dipping. Historian Ruth Goodman finds that, while bringing mistletoe inside at Christmas dates back to pagan times, the tradition of kissing beneath it is much more recent.