Time Agent (The Bloodletters)

The Corsair claimed to Venn that he'd had "practiced" having sex "a lot" with a "particularly accommodating Time Agent". (PROSE: The Bloodletters)

Behind the scenes
Although Time Agents have appeared in many aspects of the Doctor Who universe, with a mention of a particularly sexually-accomplished one bringing Jack Harkness to mind, the copyright page of The Bloodletters specified that this was, in this instance, a reference to the Time Agents featured in 's 1958 novel , not to their copyrighted Doctor Who namesakes.