Read this: Spielberg followed with War Horse, shot in England in the summer of 2010. It was released just four days after The Adventures of Tintin, on December 25, 2011. The film, based on the novel of the same name written by Michael Morpurgo and published in 1982, follows the long friendship between a British boy and his horse Joey before and during World War I – the novel was also adapted into a hit play in London which is still running there, as well as on Broadway. The film was released and distributed by Disney, with whom DreamWorks made a distribution deal in 2009. War Horse received generally positive reviews from critics, and was nominated for six Academy Awards, including Best Picture.

In what year was War Horse made into a play in London?
What is the answer? (If it cannot be answered, return "unanswerable")
unanswerable