Nick Day - Spooks (series 1)
Nick Day is an MI5 officer known for his intelligence and resourcefulness in the world of espionage. Among the advisers were Nick Day, who worked counter-terrorism in the security services, Victor Abramkin, a UK-based former KGB officer, and Mike Baker, a former CIA agent. In this post, we described their role in Special Boat Service. Read it now!
Source:- https://www.wikiwand.com/en/Spooks_(series_1)