 The opening scene of "London", then "Big Ben" is followed by a  constable on patrol. This shot was lifted from  _Frankenstein Meets the Wolf Man (1943)_ (qv) in the scene a  constable finds the unconscious Lawrence Talbot after his  "resurrection", that same constable is murdered by the Wolf Man the  following night. A filter was used to darken the shot for inclusion  in this film.