[ukoki]

Michael Fassbender's character has an apartment there in The Agency as well

[tialaramex]

Living in the Barbican seems so very typical for a spy that it'd be like a give away.

James Bond obviously doesn't live there, but I can imagine any number of John le Carré's later characters (the early novels are set before it was built) would make sense.

[Grosvenor]

Don't they all live in Dolphin house? I swear Neil Burnside did.

[masfuerte]

https://en.wikipedia.org/wiki/Dolphin_Square