The Fall
Before V for Vendetta:
Adam Sutler of the Conservative party, undersecretary of defense, authorizes development of biological weapons.
During this time the US is still involved in the Middle East. Prothero's military record mentiones service in "Syria before and after". Evie's parents are protesting US and British involvement in the "War on Terror". During this time the virus later to be known as St. Mary's and its cure are developed. Instead of being used abroad the virus is released by members of the security service disguised as muslim extremists. One target is a water treatment plant, another is a station on the London Underground and a third is St.Mary's school.
The virus will kill 80,000 and lead to a massive disruption of British society. Norsefire moves from a minor political party on the extreme right toward national prominence. Under a plan of law and order and nationalism it wins a large majority of the vote. The cure for St. Mary's is soon developed afterwards. Under the Reclamation the country is placed under an authoritarian surveillance state. Homosexuals, ethnic minorities and dissidents begin to disappear in the middle of the night. Parts of the country are placed under quarantine and the disappeared are shipped to camps in the countryside and never seen again. Records of the camps are erased. To have any sort of career in the police or government party membership is required.
Events of V for Vendetta occur.
The destruction of Parliament and the death of Sutler and Creedy leaves a power vacumn in the country. Local police and military troops refuse to shoot their own countrymen and instead attack the Fingermen (secret police). We now seen elements of Eastern Europe post 1989. The headquarters of the fingermen are overrun and all records released to the public. The surveillance state is dismantled and a caretaker government installed until free elections can be held. Investigation of records from the Finger and police along with many Norsefire members show corruption, favoritism along with other crimes.
The Monarchy is not mentioned in the movie. In the graphic novel there is mention of a Queen Zara in the beginning but nothing after that.