MI5 structural organization

[Igorak89]

Hello,

I am looking for British MI5 structural organization during WWII. I am interested in organization into divisions (A1, A2, A3, etc). I especially need info about B.24 branch since I have info only about B1-B6.

Currently, I'm researching British Double Cross system and I've found some facts about MI5 agent working in B.24, so I need more background info about it.

[gambadier]

Christopher Andrew's 'The Defence of the Realm - The Authorized History of MI5' has several diagrams giving the outline organisation at various times, but doesn't seem to go down to divisional internal organisation. The index gives a mass of references to B Branch/Division, but of course branch/division roles periodically changed.

[Igorak89]

Unfortunately, Andrew's book doesn't have information about B.24 branch.