In the movie V for Vendetta, did V blow up the Larkhill camp and escape before or after the St. Mary's virus event? I'm trying to figure if the Norsefire perfected the virus and the cure during the trials on V or post his escaping? Is there anything that points to this timeline?
In the source material, V escaped from Larkhill five years prior to the events in the book. This happened about a decade or two after the Nuclear War that devastated the rest of the world, and caused panic/riots in England (England was not part of the war, but food and other supplies are limited). In the Film, the St. Mary's Virus at Three Waters takes place of the Nuclear War. This was a false flag event used by the Fascist party, inconsistently called Norsefire, to gain power. They used the "terrorist biological attack" in order to rally support for their fascist political ideas.
The concentration camps in both versions are supposed to have come after these events. Without the nuclear war or St. Mary's virus, there would have been no way the concentration camps would exist, and neither V or lesbian actress Valerie Page would have been imprisoned.