Theory:Doctor Who television discontinuity and plot holes/Battlefield


 * There are a number of fundamental continuity problems between this serial and the BBC Wales version of Doctor Who. Dating this story is extremely difficult. Certainly, it takes place "some time" after its broadcast year of 1989. It would appear to take place prior to 2009, because the Brigadier has been knighted by the time of TV:The Poison Sky, in which he is referred to as "Sir Alistair", or 2010, the approximate timeframe of the appearance by a much older Brigadier in The Sarah Jane Adventures. Books and audios published in the 1990s and early 2000s have attempted to place the year as early 1997. However, this is not entirely satisfactory, because Battlefield makes reference to there being a king on the throne, suggesting that Queen Elizabeth II has either died or abdicated by this time. Yet she is still on the throne in the Tenth Doctor's companions' home eras. (TV: The Christmas Invasion, Tooth and Claw, Voyage of the Damned, The End of Time)
 * An attempt to reconcile the ageing of the Brigadier was attempted years prior to BBC Wales era, when the Virgin New Adventures series established that at some point the Brigadier has his youth restored to him. It remains to be seen, however, if televised continuity will follow suit. As for the issue of who is on the throne, it's possible this story takes place in a timeline that was somehow negated by other events, similar to the shortening of Harriet Jones' political career by the Doctor in The Christmas Invasion or after-effects of the Time War. It is possible that Elizabeth II's reign is not necessarily a fixed point in time.
 * Another explanation is offered by The Poison Sky, in which the UNIT dating controversy is referenced in-narrative, and thus becomes a part of the narrative continuity of Doctor Who. The implication is that, because the Doctor can't make sense of the UNIT timeline, neither should we.
 * The Brigadier's reference to "the King" is probably just a figure of speech. After all, Lethbridge-Stewart is old enough to remember the last time there was a male monarch on the throne.
 * Incidentally, these perceived discontinuity problems should really be attributed to the later episodes, not this one. That being said... Since no date is really given on this story, the relative ageing of the Brigadier doesn't present a problem. Reference to "the King" is easily explained by either of the above scenarios (figure of speech, or time being altered).


 * Why would Bessie's licence plate read WHO7 if they don't know if the Doctor regenerated?
 * Obviously intended as an in-joke, as far as in-universe it's possible it was simply a coincidence that the update licence coincided with the then-present incarnation. Since the Virgin New Adventures establishes that the Brigadier actually met the Seventh Doctor prior to Battlefield but had his memory erased, it's possible some spark of recollection remained and he might have unconsciously chosen the licence number.


 * The Brigadier mentions that UNIT has gold bullets for "you-know-what", which is implied to be Cybermen. However, when UNIT faced the Cybermen in TV: The Invasion, there was nothing to suggest that they had learned about the cyborgs' weakness.
 * The Doctor could have mentioned it during his years working for UNIT, there may have been an untelevised encounter, and at the very least UNIT would certainly have dissected the many Cyberman corpses left in the wake of "Invasion". As we find out in "Terror of the Autons", UNIT has an R&D department for investigating alien technology, and given the poor performance of UNIT weapons against Cybermen, they would have been interested in looking for more effective weapons in the event of a second encounter.