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Valedictory Despatches
You can read here (via the links above right) in full many of the valedictory despatches which feature in the series. Diplomats could say whatever they wished in their final telegram home, and they could be very frank about the cultures and countries in which they served.
Some of these files were released to the BBC by the Foreign Office under the Freedom of Information Act. The older despatches - those written more than thirty years ago - are from the National Archives in Kew.
The military are quick to see the potential of balloons for aerial reconnaissance.