Continuity mistake: When Jim and the other two characters are making their way to Jim's parents house, they are seen on the Docklands Light Railway track going towards a place called Island Gardens. The next shot shows them at a station called East India which is completely the other direction to where they were going down the track. Obviously, only users of the railway would pick up on such error though.

28 Days Later (2002)
Plot summary
Directed by: Danny Boyle
Starring: Brendan Gleeson, Cillian Murphy, Christopher Eccleston, David Schneider, Alex Palmer, Bindu De Stoppani, Jukka Hiltunen
A virus that locks those infected into a permanent state of killing rage, is accidentally released from a British research facility. Carried by animals and humans, the virus is impossible to contain, and supposedly spreads across the entire planet. Twenty-eight days later, a small group of survivors are trapped in London, caught in a desperate struggle to protect themselves from the infected.
Selena: It started as rioting. But right from the beginning you knew this was different. Because it was happening in small villages, market towns. And then it wasn't on the TV any more. It was in the street outside. It was coming in through your windows. It was a virus. An infection. You didn't need a doctor to tell you that. It was the blood. It was something in the blood. By the time they tried to evacuate the cities it was already too late. Army blockades were overrun. And that's when the exodus started. Before the TV and radio stopped broadcasting there were reports of infection in Paris and New York. We didn't hear anything more after that.
Trivia: Mark was likely not infected. The wound on his arm was clean-cut and probably from either glass or a weapon wound. A bite mark would look very different. It is likely that he asked Selena to wait because he was scared and knew what she was like.
Question: At the end we are left with the question of the pilot's intentions, and what happened. Is he going to help them, or pull an about-face and machine-gun them down thinking they're infected?
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Answer: That question is actually answered. The pilot is speaking Finnish, and he says into the radio "lähetätkö helikopterin" which translates as "Can you please send a helicopter?" Looks like he was actually helping them after all, and there is still some civilization (or at least people with radios and helicopters).