This is great!
It also has me thinking of an Australian setting... and after a bit of searching, I found that the Special Intelligence Bureau was created in 1917, which was a branch of the MI5 in Australia.
It was indeed all you have to do now is find out who was running it. I'll have a look in my book see if i can find anything in the Order bit in the Appendix.
If not look at Wiki as i found so much there when i was looking.
Like the Info on the Welsh Library as well. I've just been very general when i've dug up info. Might look at more specifics now i have some more time and expand elements.
But hey guys throw more in as its great to work together to expand stuff.