It seems that MI5 concentrated more on internal threats, and MI6 more on external, but in the case of Mr. Howard, it is not made clear what his connection is to the Secret Service, it is only intimated that he comes from those offices. MI5 has its own colloquial name: Box 500 (after its official wartime address of PO Box 500).
So I suppose I could scoop that as a name instead. What do you think? I don’t know why but Box 850 sounds cooler and more mysterious than Box 500. But maybe that’s just me.
I am going to need this note from my would-be art thief in Book 5 (tentatively titled Box 850), so I started exploring it:
How about this for an evil note from our would-be art thief? I wait for you to be in your most joyous celebration
and that is when I will strike
and take back what is mine
the archer of my village
and you will never see me
or know I was there
So in Latin (Lord send me someone who can make this accurate please) could be: Exspectabo te laetus in celebratione
et quod suus cum percutiam
et retro quid nostra
in pandus mei castellum
et numquam videre me
vel scio erat