It's Christmas at the Barn, and the doors are open wide to welcome some very special guests. Dame Helen Mirren, Julia Donaldson, and Rob Brydon arrive bearing a collection of cherished items in need of a festive fix. With the season in full swing, the team also turn their skills to repairing a mechanical reindeer, a broken sledge, and a much-loved carol book at the heart of a treasured Sheffield Christmas tradition.