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.
More top news
The Purple Rain singer died in April 2016
Fewer than a quarter of commuters want fellow passengers to start conversations with them on the Tube.
The grazing is part of a wildlife scheme to help a flower meadow and the insects that rely on it