A scene filmed at Westminster required the area from Trafalgar Square and Whitehall up to the Parliament buildings and Big Ben to be closed for three nights from midnight to 5 am. Helping the filmmakers to acquire this unheardof filming access was Euan Blair, son of Tony Blair, the Prime Minister, who worked on the film's production.
The content of the film drew criticism of Tony Blair from MP David Davis. The filmmakers are insisting though, that Euan Blair had nothing to do with it and that the rights were obtained through 9 months of negotiations with 14 different government departments and agencies.
According to the filmmakers, the most difficult part of filming was bringing V to life underneath an expressionless mask. To correct this lighting, acting and Weaving's voice were brought together to create the proper mood for the situation. A microphone was placed inside the mask to prevent Weaving's voice from being muffled and to help in post production.
