The BBC TV drama series Spooks shows fictional MI5 Security Service agents in action.
Instead of Thames House, the series uses Freemasons' Hall, used by the United Grand Lodge of England, in Great Queen Street in Covent Garden
Freemasons' Hall
60 Great Queen Street
London
WC2B 5AZ
GPS grid coordinates:
Latitude: (WGS84) N51:30:55 ( 51.515161 )
Longitude: (WGS84) W0:07:16 ( -0.121137 )
The interior of this building has also been used for several Poirot episodes, as a hotel and as the setting for a fashion show (!), and also for an episode of Campion, standing in for the British Embassy in (I think) Warsaw.