The book is out of print, the British Druid Order has a place you can download it, which I did. It is super interesting, in that the author has added later notes, and notes from readers who have sent them in that she wanted to include.
The first part, about the history of Druidry and it's roots was very good, but took up maybe too much of the book. It's an older book, and I think answers questions people don't have anymore, or that can be answered in thirty seconds on the internet.
It's not a system that is complete, like JMG or ADF tries to give you. I didn't leave it with any sense of what I would do when I put the book down. It wasn't terrible. It is the book, or was, the book someone needs.
She talks about doing a new edition, and I would be very interested in that, but this seems more of an artifact of its time, and not a particularly interesting one.