This Doctor Who screencap contains
cellula, cella, cella di prigione, and cell.
There might also be
penitenziario, penna, istituto penale, struttura penale, istituzione penale, and penale facility.
BBC1 are now airing a Natale trailer featuring several brief new clips from The Snowmen. For those that missed it, here’s a video with just the Doctor Who scenes.