Works relating to Agatha Christie
- 1975 - He took part in the radio programme The Mysterious Dame Agatha
- 1977 - He wrote the introduction to Agatha Christie: First Lady of Crime and the essay The Mistress of Complication, included in the book.
- 1980 - He wrote the introduction to the Collins Crime Club hardcover edition of The A.B.C. Murders
- 1983 - He wrote the introduction to The Scoop and Behind The Screen