The bundle contains letters from admirers, The Railway Magazine, TeleRail Productions, British Transport Commission, British Railways Scottish Region, correspondence from Adolph Giesl-Gieslingen (an Austrian locomotive designer and engineer) who mentions Kenneth Cantlie in one of his letters, Hand Made Films, Twentieth Century Fox Film Corporation and Warner Communications Inc. Included is a handwritten letter written by Helen Beatrice Handford (Peter Handford's mother) about the work of the Army Film and Photographic Unit.