Episode #4.2 - S4-E2
Continuity mistake: The ladder carried by a bomber is a plain, ordinary ladder. After he puts it up against a post, it changes to an extendable one made up of three connected ladders.
Episode #4.2 - S4-E2
Other mistake: There is a scene set in the basement of Thames House. It is one of the most secure buildings in the country, but has graffiti on the walls.
Answer: The shots of the tube station closing and the shot of the concourse were shot at Marylebone station. There is also a shot of the tracks in which a sign is visible pointing to Southwark station and the Jubilee Line, and I suspect this is a stock shot filmed at Waterloo station.
Sierra1 ★