[3] Neil-Smith wrote Praying for Daylight: God Through Modern Eyes,[4] as well as The Exorcist and the Possessed, in which he detailed his experiences with and beliefs about exorcism.
[6] Appearing on radio and television programmes, he became notable as an authority on the subject of exorcism when William Peter Blatty's The Exorcist was released in 1970.
According to biographer Trevor Beeson, the media coverage he gained "emphasized the more dramatic elements in his ministry, and encouraged him to extravagances which he later regretted."
A colleague of Neil-Smith, Jack Dover Wellman, vicar of Emmanuel Church, Hampstead was also an authority on the paranormal and upon exorcism, although with a greater emphasis upon Christian spiritual healing.
Dover Wellman appears to have taken a gentler approach to his ministry than Neil-Smith sometimes managed, and maintained that to be psychic was a gift from God which needed to be developed in strict conformity with the teachings of Christ.