For fans of Ian Watson's The Embedding , a miglior fabbro — C. S. Lewis on Charles Williams.
This is apparently a brief excerpt from an audio book, "C. S. Lewis Speaks His Mind."
A printed version of Lewis's remarks on Williams, "The Novels of Charles Williams," appears on pages 21-27 of On Stories: And Other Essays on Literature by C. S. Lewis (Houghton Mifflin Harcourt paperback, 2002 reprint of a book first published in 1982, edited and with a preface by Walter Hooper).
From the preface—
"'The Novels of Charles Williams' was written at the request of the British Broadcasting Corporation, and Lewis read it over the Third Programme of the BBC on the 11th February 1949. It has never been published before and, indeed, had lain undetected in the BBC Written Archives until I came across it quite by accident in 1980."