These unnamed men work for the British Men of Letters.
Background[]
These two men joined Arthur Ketch in a mission to infiltrate, search and wiretape the American Men of Letters bunker. The orders came directly from Dr. Hess and were passed onto them.
Ketch ordered them to find out all they could about Sam and Dean Winchester, down to how Sam gets his hair so shiny and how many "ratty" flannels does Dean own.
Both men are shown installing devices in the bunker, and placing them in well-selected locations. After their work is complete, they leave the bunker with Ketch.