https://www.bible.ca/pre-british-israelism-foy-wallace.htm
https://www.stempublishing.com/authors/pollock/The_British-Israel_Theory.html
Here are some articles I found refuting British Israelism. The most interesting part is that apparently CI was used to mobilise people to fight against Germany.
>But the Anglo-Israel "scriptural intimation" consists in interpretations of prophecy that are purely arbitrary. For instance, they apply certain prophecies to the cities of the :Axis Powers today that definitely referred to Babylon, Nineveh, Tyre, and other cities of antiquity.