This week's showdown is films set in confined spaces. How confined, you ask? The powers that be note a confined space is "smaller than a house or large spaceship or Titanic cruise liner." Since Buckingham Palace is a house, this leaves rather a lot of wiggle room—much more than is granted the characters in some of these films.
In any event, the films below are some combination of mostly-single location films in which a sense of claustrophobia or limited range of motion presents itself in some way or another, at least for me. Confinement-mileage may vary.