Mycroft Holmes

Mycroft Holmes was the brother of Sherlock Holmes and an ally of Bernice Summerfield. (BFBS: The Adventure of the Diogenes Damsel)

Biography
The Seventh Doctor, Ace and Benny met him previously, while Mycroft was, at the time, under the employ of the British government, quite probably the British Foreign Office. (NA: All-Consuming Fire)