The Day of the Clone - Pt 1 - S1.E21

Simon is at the Ministry of Forward Development in Whitehall looking for Commander Traynor. The doorman is adamant he can't enter the building without a pass. Spotting Miss Stebbins in the corridor, Simon brushes past the doorman and pleads with her to see the Commander. Miss Stebbins explains that Commander Traynor is at 'R1' but she refuses to go into further detail about what 'R1' is because of the Official Secrets Act.