A special behind-the-scenes look at what makes Christmas so special at Marks & Spencer, offering unprecedented access during the retailer's busiest period. The programme follows the latest products in development, including a spicy glazed turkey crown, a festive makeover for Colin the Caterpillar, and a daring new cheese that is infused with black garlic, while store manager Ash oversees a multimillion-pound renovation in Northern Ireland that needs to be finished for Christmastime?