This film feels more like a meditation on what happens to people when they are reduced to their lowest elements. A recorded message of a 'paradise' where 'salvation' can be found is tracked by Frank(the man) on his shortwave radio.
From there,he also meets a man and his daughter(Brendan Gleeson,terrific,and Megan Burns,good)and they try to find a refuge out of London-town. As he searches London for signs of life,he is rescued from raging zombies by a couple of survivalists(one of them,the lovely Naomie Harris)who he follows from place to place to keep alive. The 28 Days later of the title cuts to a mostly abandoned London where a coma-tized bicycle courier named Jim(Cillian Murphy,effective) wakes from his stasis to find himself alone in a hospital. When environmental terrorists attack a lab that contains diseased chimps who are infected with a 'Rage' virus, they unwittingly let loose a plague that lays waste to England and(perhaps)the rest of society.
I didn't get around to seeing it until a few days ago and I gotta feel like that was somewhat of an embellishment on the promoters' part. The 2003 State-side release of Danny Boyle's '28 Days Later' was advertised as being a shockful scare-fest of a movie.