Unmentioned members of the Diogenes Club
- Jago and Litefoot from Big Finish Doctor Who
- Inspector Dugan from City Of Death, a rival of Regent's on the force, who suspects his colleague is up to something and keeps stumbling into the case of the week.
- Batman's batman, Alfred Pennyworth, whom we know to have been a secret intelligence agent and furthermore a (Depending on the Writer) RAF medic (perhaps he served alongside Winthrop?)
- Adam Adamant until his disappearance. And maybe later.
- Seemingly confirmed in "The Man Who Got Off The Ghost Train", where his name is among those dropped in the narration of Richard's inner musings.
- Jeeves, who is keeping tabs on Bertie Wooster for God knows what reason
- Mr. Steed and his various female assistants, of course
- Aren't he and Emma Peel going to feel a little disquieted by a secretive club run by a Peter Wyngarde lookalike?
- Lady Penelope
Unmentioned members of the Unnameables
- Out in the San Francisco office, Brett Kingsford from the abandoned pilot Dark Intruder
, working in tandem with Jeff Cable and Cash Conover from the TV series Barbary Coast. - Baltimore wax museum operators Anthony Draco and Harold Blount.
- Eaton and Musgrove, those two guys who contact Indiana Jones at the beginning of Raiders of the Lost Ark. Dr. Jones himself is a bit too flashy and public a figure to be one himself.
- Kolchak: The Night Stalker keeps pestering them but they just confiscate his tapes and kick him back out.
- Charlie Chan
- A strange devil creature with filed down horns who was discovered by US Air Force troops on an island off of Scotland during WWII.
The Undertaking was founded by Inspector Lestrade
We know that in Newman's universe Mycroft Holmes is in charge of Britain's intelligence, the elder Moriarty is in charge of her military intelligence, and Irene Adler was an agent of the Opera Ghost detective agency. Clearly, this trend must be pervasive throughout Newman's universe and what would Lestrade like more than to keep all supernatural threats locked up and hidden from public knowledge, as the Undertaking does?- Sorcerer Conjuror Wizard Witch establishes the agency's creation as happening during the first Queen Elizabeth's reign.
Colonel James Moriarty built the train in Man Who Got Off The Ghost Train
In his debut story The Greek Invertebrate he waxes poetic about the future of the British army while showcasing a WMD disguised as a train. Clearly, this is a man who thinks a lot of trains (as a typical Victorian Englishman might well) and their military applications (as an avid student of military history might well). Ergo, using a train as the cornerstone for NATO's defense system seems up his alley. The Diogenes Club transferred assets to Kingsman tailors
The Club's all boarded up by the 70s, but we're all pretty sure its membership is still active. This seems as likely as anything. Pony-Tail is the daughter or granddaughter of Sterlyng from The Haunting Of Drearcliff Grange School.
Both of them grow their hair to incredible lengths and use it almost like Prehensile Hair in their conquest of victims; the only real difference is that "the Knout" used hers as a physical weapon and Pony-Tail, a seductive one.