https://historicinterpreter.wordpress.com/2015/07/14/spying-for-the-crown-british-intelligence-in-the-georgian-era/#more-385
https://historicinterpreter.wordpress.com/2015/07/28/spying-for-the-crown-part-2-french-revolution-and-the-napoleonic-era/
https://historicinterpreter.wordpress.com/2015/08/11/spying-for-the-crown-part-3-military-intelligence-during-the-peninsula-campaign/
https://historicinterpreter.wordpress.com/2015/08/25/spying-for-the-crown-part-4-civilian-spies-for-wellington/#more-411