When it comes to Christmas food and entertaining, Britain's country houses have always put on a show. In this sumptuous and heart-warming program, Mary Berry visits Harewood House in Yorkshire to meet its army of skilled staff and dedicated volunteers as they prepare the house for Christmas. With its Robert Adam's interiors, Chippendal furniture and Capability Brown gardens, Harewood is one of the nation's most beautiful stately homes. Mary discovers how houses like Harewood celebrate Christmas on a grand scale and shows us how to make delicious modern recipes inspired by forgotten festive dishes of the past.