Shit, it wasn't until I just looked up the date for this review that I realized I've just watched a sequel. I thought I was watching 28 Days Later the whole time. Oh well. Guess I need to see that one now.
Flatly put, I loved this movie. Really fucking scary and tense from start to finish, with a plot and characters that you care about and fear for. A lot.
The premise is similar to I Am Legend in that a supervirus has turned the inhabitants of Great Britain into rabid zombie-types. Think "reevers" from Serenity. Gotta say, if I ever go up against a group of zombies, I'd much prefer the old school lumbering slobs. I guess the virus outbreak took place in the original movie, so this one takes place 7 months later. The island had been put in quarantine and now NATO has moved in to begin reconstruction, starting in London. About 15,000 Brits have been repatriated into a safe zone, but the army is confident that the virus is dead and gone. I was shocked when they were proven wrong! And yes, there's a nod to Aliens here, for sure.
So it becomes a chase to get these 2 kids (who might carry immunity) to safety across the channel. Along the way, there's plenty of frights and gore, but most of all it's just a really fun ride. The cast is excellent, especially Robert Carlyle, who plays the father of the 2 kids.