This debuted on the West End in the 05-06 season. Supposedly Elyot's version was much more gruesome than Christie's own adaptation, and showed a good deal of violence onstage, including the original ending.
Did anyone manage to see it? There's very little information online; it is all the same publicity packet stuff about the premise of the show rather than any actual information on the changes Elyot made. It'd be great to find out more.