British Israelism is an insidius form of religious fraud. I should know ... it was taught in the college I graduated with a degree in theology from. But then, 99.99 percent of so-called Christians are absolutely clueless when it comes to the book of Revelation.
It is an initiatory text of the ancient Christian Mystery School, which emerged out of the Essene Brotherhood. The text has ABSOLUTELY NOTHING to do with any kind of prediction for the future. The symbols are designed to illustrate the psycho-biology of humanity and what happens when that psycho-biology is awakened. Kundalini awakening is what the book describes. It is possible to experience the book of Revelation. I have. The symbolism does not describe any events for the future.
All books teach anything otherwise are a fraud, namely virtually every book you will find in any given "Christian" bookstore.