I have read "My Father's Guru" - and it is indeed an odd book, generated from an odd man (who has written a similar book about Freud). The only thing that I found useful in that book was the contextualization of PB - he evolved in a period when occultism and peculiar cults were abundant amongst the post-war intelligentsia - which is one reason, I believe, that he became a recluse in his later years, and also explains his very strong criticism of all things occult. Certainly there was little of the PB that I encountered to be found in that book.