A news crew goes out into the English country side to interview some people. They are making a documentary about a virus. Suddenly everybody has the virus.
The movie is presented in the form of a documentary. In this aspect it shares a lot with Cannibal Holocaust, Blair Witch Project, Rec, and Romero's Diary of the Dead. Of all these, The Zombie Diaries most closely resembles Blair Witch Project.
The movie starts well, then gets worse, and worse, and worse. Whilst it is attractively packaged the The Zombie Diaries is a low budget affair with no original ideas, a poor script, and bad acting.