Level Designer [Valve Hammer] job - 28 Days Later mod for Half-Life

You are Jim, a bicycle courier who was in a crash and was put in a coma. Meanwhile, a group of animal rights activists release infected chimpanzees from the Cambridge research facility in Manchester, because of this the virus spreads across Manchester but because of all the fires that broke down during the outbreak and because there's no fire crew to stop the fires, the infected ran away into different cities in England and decimated England in a matter of weeks. The military blockades were overrun and when they tried to evacuate the cities it was already too late, the infection was everywhere. Now there's no government, no police, no army, no tv, no radio and no electricity. Then, 28 days later after the initial outbreak Jim wakes up from a coma and slowly finds out what's going on. Jim then goes on a quest to find his parents.