This series contains all the Secret/Top Secret correspondence files for the Embassy from 1952 to 1953. When a piece of correspondence arrived in the Embassy that had a security classification of secret or higher, a new file on that subject was raised even if there was an unclassified file in existence.
 
The Secret/Top Secret files used the same primary headings from the standardized file system for overseas posts as the unclassified files but the allocation of secondary numbers was different. This resulted in there sometimes being two files (one classified, one unclassified) in the Embassy with the same number but different titles or the same title and different numbers.
 
The Secret/Top Secret files were regarded as a different file series from the unclassified files and were stored in a different area of the Embassy because of the need for security. Amongst the subject areas covered by the files are Political Intelligence, International Organizations (eg United Nations), Procurement of Military Equipment and International Treaties.
 
The files have a year(s) stamped on the cover and some of them have a prefix (S, SG, TS) denoting security classification. These were most probably added after the files were raised. The year stamp(s) give the date range of the file and, with the prefix, may have been added to assist staff in distinguishing between files with the same number or title but from different series.