MI5’s headquarters are at Thames House, London. ... While the head of MI6 (SIS) is still referred to as "C" today, the Director General of MI5 has not been known as "K" since the 1940s. See The establishment of the Secret Service Bureau for the full story of how MI5 was founded.
Krivitsky’s debriefing in London, conducted over the course of four weeks in January and February 1940, occupies a singular place in the annals of MI5. The debriefing was the first of its kind, the earliest attempt at what would later become a standard practice in handling defecting or active enemy agents. It...
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