Printers William Clowes, one of the largest printers in England, and a major sponsor of the exhibition, issued this new edition of Charles Knight's biography of Caxton. The firm had printed the first edition of the biography for its author, Charles Knight in 1844. The original edition included a postscript commenting on developments in book production from the 15th century up to the mid-19th century. That was not included in the new edition.