Did you ever read those George Smiley novels? The British spy books? Tinker, Tailor, Soldier, Spy; The Honourable Schoolboy; Smiley's People?
I was just thinking . . . if they were written today . . . the big twist would be that Karla-Smiley's elusive nemesis-is actually hiding inside that London fatberg they cleared out a couple of years ago-I mean it all fits.
If I were trying to hide from fancy British spies I would definitely try to hide in the least fancy place of all-and do it on the enemy's turf, too, just to rub that shit in.
You gotta rub it in.
So . . . it all fits.
You could have a full listening post.
Right inside that legendary London fatberg.
A comfortable fit at that.