The Wartime Journals - Hugh Trevor-Roper - Google Books

http://books.google.de/books?q=Klop%20Zech-Nenntwich&id=Q6bVKH4tuX0C&pg=PA268#v=onepage

"As a British Intelligence Officer during the Second World War, Hugh Trevor-Roper was expressly forbidden from keeping a diary because of the sensitive and confidential nature of his work. He had many high-placed enemies in the Secret Intelligence Service…