OC here - I should clarify that will only be a couple pages of my work, not its primary subject. But I can't pass up an opportunity to tout Mander's book. It is extraordinarily profound and insightful.

Also, I cannot remember the exact details at the moment, but I remember seeing what Dion Fortune would have called "turns of phrase" that made me wonder if he was not some kind of initiate. That's total speculation.