British Historical AU: As If I'd Always Slept

[xc0l0rful.livejournal.com]

I am looking for a historical AU, it was pretty long, and B/J were I think British... Brian was a spy or something and Justin was originally just a messenger but ends up staying...?

I've tried looking through the memories but the name of the story and the author's name escapes me. I believe the author might have also been British irl...

Any help would be appreciated. :)

FOUND! As If I'd Always Slept...more info in comments.