Agent Zig-Zag ? Another quote: > 'Chapman's deception messages have survived only in fragments. MI5 was careful to destroy the traffic, aware of the potential repercussions if the inhabitants of south London realised they were being sacrificed to protect the centre of the City.' I've not read this one yet, but, if this is a representative quote, I would treat this book's accuracy with caution. No history book published since 1990 should be saying this as Volume 5 of of "British Intelligence In The Second World War: Strategic Deception" edited by Michael Howard was published in that year. Specifically, Chapter 8 "Crossbow: The Flying Bombs June-December 1944" covers the subject in detail, quotes from the official documents, and in the "References" at the end of the chapter lists large numbers of extant official files on the subject. Actual transcripts of the individual signals may have been destroyed in the postwar bonfire, but the records were not.