Looks like "Dead Set" - the other UK Zombie Big Brother

I think a lot of the "I survived a Zombie apocalypse" is based on the 2008 Dead set mini-series.
The basics are just slightly turned... in "dead set" the outside-world is zombiefied and the contestants are still human and try to survive.
In "I survived.." the contestants are dropped into a mall-area.
Personally i think Dead Set is slightly better done.