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[–] Veryconcerned71 [S] 0 points 1 point (+1|-0) ago 

OK guys.... Dug a little deeper. There is a book called "MI5 IN THE GREAT WAR!"

Chapter V - 1918

"The collection of ciphers and codes (D5) was handed over to D Branch as also the coordination of British Special Intelligence Missions in Allied Countries (D4)

Tell me that isn't relevant? Here is the link to that book:

https://books.google.com/books?id=-Zw5BAAAQBAJ&pg=PT405&lpg=PT405&dq=D5+MI5&source=bl&ots=0hMTsI9VBm&sig=VuqSdbVvsftBfkSq6fJShbln_PI&hl=en&sa

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[–] VigilantTruthSeeker2 ago 

That is very interesting. Thanks for the info.