let me see....last night I was to watch an episode of JONATHAN STRANGE & MR NORRELL...one that I had formerly watched with gill...'so many years ago now' and upon the other side of the mirror...he was to tell me watch it again - at this stage in this 13th one ill cult game...because it would explain a lot....and so it did - available on iplayer:

 

MI5 had already joined up the dots - see below: