Intelligence Taskforce
In the late 1960s in Jenny Cornelius's home universe, she had contacts at a secretive international Intelligence Taskforce which had an office in London. These included the local Laura Drake, who worked in the P.R. office, and the no-nonsense officer Captain Stewart. Jenny speculated that within “ten or twenty years”, Stewart would rise in the ranks and be “a brigadier or something”. (PROSE: The Folly of Men)
Behind the scenes
Captain Stewart is implied to be a younger version of Doctor Who's Alistair Gordon Lethbridge-Stewart, who has yet to be granted his iconic rank of “Brigadier” within UNIT, the United Nations Intelligence Taskforce.
Jenny suggests that Stewart will be a Brigadier in “ten or twenty years” — that is, either in the 1970s or 1980s, taking the setting of The Folly of Men to be the 1960s. Her uncertainty is a nod to the infamous “dating controversy” about the present-day of the original run of Doctor Who serials featuring the Doctor working with UNIT: these were originally broadcast in the 1970s but with a loose premise of being set in the near future. This intent was gradually lost and, during the actual 1980s, a story was broadcast which outright treated the UNIT stories as having taken place when they were broadcast, i.e. in the 1970s.