A show worker was seen blasting the set with a snow machine, while horses and carts and similarly-attired extras were also on hand to help transport Bristol city centre back to the 1890s for the festive episode.
Earlier this month, guest star Tom Ward, best known for his role in Silent Witness, was photographed during the filming, along with Neve McIntosh who returns as a scary-looking Madame Vastra the Silurian in the seventh series.
The episode is rumoured to be the one where the Doctor is introduced to his new companion and will also feature guest star Richard E. Grant - who played the Doctor once in a 2003 animated special Scream of the Shalka - as the new villain.
Meanwhile, the BBC have released 20 first-look photos from Doctor Who series seven, showing the return of some frightening enemies and a preview of Amy Pond's departure from the show.
PHOTOS: Matt Smith and Jenna-Louise Coleman in the Doctor Who Christmas special...
More Christmas special photos...
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