Corrected entry: The timing does not line up with two characters who, as the movie suggests were imprisoned at the same time. V seems to suggest that Larkhill happened 20 years ago, and the BTN verifies this when they reported that V was connected with the Larkhill explosion 20 years ago. However in Valerie's letter it says that she acted in a movie and moved to London in 2015 and got imprisoned somewhere in that time frame. The movie takes place in 2020.
rdjaxx
14th Dec 2015
Correction: The film is set in the late 2030s.