The Enfolded Time (short story)

 was a story which was original to the anthology The HAVOC Files. It asserted that due to the Doctor's frequent visits to the 1970s and 1980s in his faulty TARDIS, the two decades were merged into one and 20 years of Earth history took place over the course of 10.

Summary
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Characters
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Continuity

 * The Gwanzulum once tried to infiltrate the Home Army Fifth Operational Corps. (COMIC: Planet of the Dead)
 * 6 years earlier, Alistair met his younger self and had his memories of encountering aliens restored. (TV: Mawdryn Undead)
 * Alistair mentions "all that business with the dinosaurs in 1974". (TV: Invasion of the Dinosaurs)