A blog on the Dr Who website said that the production team was recreating an iconic scene from a 1964 episode of the sci-fi drama. The Dalek Invasion of Earth saw the alien cyborgs arriving in London and passing the Palace of Westminster.
The BBC tweeted a picture of the original film.
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Drivers belonging to the RMT union are due to walkout at 9.30pm on Saturday in a dispute over a sacked colleague.
A new opinion poll gives the party an increased lead at the expense of the Greens.
The Rail Minister said it was not a matter of crowd control but passengers "trying to get home after a long day at work".