A thrilling journey through legends, belief and folklore, this film goes behind the scenes with the British Library as they search to tell that story through objects in their collection, in an ambitious new exhibition: Harry Potter: A History Of Magic. J.K. Rowling, who is lending unseen manuscripts, drawings and drafts from her private archives (which will sit alongside treasures from the British Library, as well as original drafts and drawings from Jim Kay) talks about some of the personal items she has lent to the exhibition and gives new insight into her writing, looking at some of the objects from the exhibition that have fired her imagination.

• BBC Studios Documentary Unit
• Imelda Staunton
• J.K. Rowling
• David Thewlis
• Warwick Davis
• Evanna Lynch
• Mark Williams
• Miriam Margolyes