The question now is why the files weren’t published. Did the reporter who received the files sit on the story, or did his bosses at the BBC quash it? The reporter had recently written a piece questioning global warming, which has stalled out for more than a decade, so it seems like something he would publish if it were up to him.
UPDATE: This may be a misunderstanding. The reporter says he received some of the emails in October as a response to his article, not that he received the entire archive. He mentioned that he had received them only to confirm that those emails at least were authentic. That seems to make this post moot.