Staircase

Torchwood Tower had multiple staircases. (TV: Doomsday ^[+]Loading...["Doomsday (TV story)"])

There was a staircase at 10 Downing Street, which "Joseph Green" was walking up when he was informed by Indra Ganesh that, in light of the Big Ben incident, he was now Acting Prime Minister. Green then farted loudly, which he blamed on a nervous stomach; actually a Slitheen in disguise, he was experiencing gas exchange. (TV: Aliens of London ^[+]Loading...["Aliens of London (TV story)"])

Tish Jones was walking down the same staircase in Downing Street when she received a phone call from Martha Jones. Tish told her sister that she could not talk at the moment, since they had just made first contact with the Toclafane, just before she was grabbed by two heavies working for Prime Minister Harold Saxon. Tish dropped her phone on the floor as she was dragged up the stairs, loudly protesting and calling out to Linda. (TV: The Sound of Drums ^[+]Loading...["The Sound of Drums (TV story)"])