This is not anything to do with the 28 Days Later films, but a shameless cash in / confusion causer. Originally called Last Rites and more appropriately Gangs of the Dead, this film is quite high on production values but doesn’t deliver.
The gore effects are excellent for a low budget movie, some of the CGI stuff is a bit lacking, e.g. cars exploding but the sound levels are woefully poor.
There are too many characters for you to concentrate on them all, and they are all villains.
The story is weak, with a bleak ending. Not quite good enough.