Tony Simpson, in sending the scanned letter on 7 September 2024, remarked that it was from the BRPF's Beatles file. The enclosures are two treatments of a proposed anti-war film involving the Beatles. The earlier treatment, by Emanuel Litvinoff, is 5 typed pages; the second, more humorous, by an unknown author (but possibly Len Deighton), is 4 typed pages. 

The letter has no sender's name. That was Schoenman's custom. The letter refers to the author's "trip to Vietnam". Schoenman's report on his trip to Vietnam is dated 11 March 1966 and is included in War Crimes in Vietnam. The importance of the subject matter supports his authorship rather than that of any other employee of the BRPF.