British Men of Letters compound

The British Men of Letters compound is the base of operation of the British branch of the Men of Letters.

History
Shortly after The Darkness and God reconciled and left the Earth, the British Men of Letters made the decision to start working on the monster problem in America, relocating some of their equipment and operatives to an abandoned factory they managed to transform into a secure compound.

The base is made up of a series of modular containers and includes accommodation, a computer room, meeting room, and an armory.

Season 12
In The Raid, the British Men of Letters invite Sam Winchester to visit their compound and take part in Operation V, a project centered around the extermination of all vampires in America. Already present are Mick Davies, McGillicuddy, Alton Morehead, Serena Colman, Pierce Moncrieff and Mary Winchester.

The project goes awry when their intel fails to anticipate them for an attack from the very vampires they were hunting. The Alpha Vampire breaks in and kills numerous staff members, but he is shot and killed by Sam with the help of Mick. Despite the disaster, Sam agrees to work for the Brits just like his mother is.

In The British Invasion, Mick encounters Renny Rawlings at the compound, and learns that Dr. Hess wants Renny to accompany Mick on his final mission to recruit the American hunters, otherwise he must kill them. The mission fails and Renny ends up dead. When Mick returns to the compound he is confronted by Dr. Hess and Arthur Ketch.

When Mick tries to reason with Dr. Hess about the flaws of their special Code, Dr. Hess orders Arthur to shoot Mick point blank in the back of the head. As Dr. Hess discusses her intention to have the American hunters annihilated, Mick's body is visibly, half across the table with blood pooled under his head.

In The Memory Remains, Arthur Ketch is seen at the compound after successfully infiltrating and wiretapping the Men of Letters bunker. He calls Sam and Dean to inform him that Mick is absent and he will be the person they report to. After the call, Arthur listens to their conversation, and hears Dean insult his motorbike.