Chapter 18 describes a miracle where Sai Baba would tell a story about London, and then the devotee would hear that exact story read from the Jnaneshwari. Can you elaborate on this?

You are partially correct about the nature of the miracle, but the detail about London is not found in the text. Chapter 18 describes a "great wonder" where Baba would sometimes tell a short story to a devotee and then send them to listen to the public reading in the Wada. The miracle was that the devotee would then hear the very same story being read from the book, which provided "confirmation and full understanding." The text states, "Jnaneshwar’s Jnaneshwari or Eknath’s speech would just be a translation of Baba’s story." However, there is absolutely no mention in this chapter of the content of these stories being about London or any other foreign place.