 It was not however until 1976, after extensive study, research and travel in India that he completed "The Heart of Religion", a profound study of the essence common to all religious experience.During these years a frequent visitor to his south London home, "Dilkusha", for advice on Eastern religions was Fritjof Capra, author of "The Tao of Physics" et alia.He subsequently published three more books, "Zarathushtra" (1985), "Buddhahood" (1988) and "Holistic Consciousness" (1989).