A sequel of sorts is now posted as a separate story: "Harry Potter and the Inevitable Battle". I apologize for the inconvenience, but it grew too big to just be another chapter.
Harry Potter and the Alternative Tournament by twistyguru
Harry Potter & Mary Poppins Xover Rated: T, English, Humor, Harry P., Words: 46k+, Favs: 2k+, Follows: 603, Published: 5/14/2011 Updated: 6/8/2012}
422 Chapter 6: A Sequel is Now Available