Author Michael Prescott has written a lengthy blog post on If This Be Magic: The Forgotten Power of Hypnotism, by SPR Council member Guy Lyon Playfair.
Michael's blog post is here:
http://michaelprescott.typepad.com/michael_prescotts_blog/2017/01/magic-time.html
More information on the book:
https://www.spr.ac.uk/book/if-be-magic-forgotten-power-hypnosis-guy-lyon-playfair
Guy's page in the SPR's 'Who's Who':