It's a verse epic recounting the history of Britain from the earliest times (literally the earliest times) to the Battle of Britain. Wikipedia claims that "its entire first edition of 23,500 sold out immediately, even in wartime conditions, and was then reprinted". However, The Oxford National Biography says it "was largely ignored".
As far as I can tell, the text is not available anywhere online, which is not surprising considering it would still be in copyright.
I wonder how many people have read this work in the last few decades? Very few, I imagine, which is an added inducement for me to read it.
The copy in my own library is in Special Collections, which means I can't bring it home. So reading it will require added effort. It's more than four hundred pages long.
Not only do I intend to read it, but I intend to write about it here as I read it. So there's something for you to look forward to.