File Title 'C', Chief of the Secret Intelligence Service (SIS): Telephone Tapping
Reference FO 1093/311
Date 1 April 1940 - 9 December 1942
Government Department Foreign Office
File Accession Date 23 May 2013


A file of correspondence concerning British telephone surveillance of foreign embassies in London. Documents include a complaint by the Belgian ambassador about the interference to his telephone caused by the tapping equipment; a Foreign Office memorandum about security arrangements for confidential communications; arrangements for the tapping of various embassies including the Soviet, Chinese, Free French, Portuguese, Spanish, Mexican and Turkish; and an intercepted telephone conversation between two Free French officers revealing an unsuitable treatment of classified documents.

Document Title Date
i Front Cover Download PDF (191 KB)
1st 'C', Chief of the Secret Intelligence Service (SIS): Telephone Tapping Download PDF (4.32 MB)
ii Back Cover Download PDF (121 KB)
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