When Danger Man was first broadcast as a half-hour series, Drake answered to a superior named Hobbs. When the series came back, it had been slightly 'ret-conned', and Drake - no longer an agent of NATO, but a British M9 agent - the character was dropped, and Drake was shown working under the command of several superiors.
In this episode - The Man with the Foot - Drake's superiorr is an M-like character, played by 'Bernard Lee', who (at the time this episode was originally broadcast) had just started to play M in the Bond films.