The Rezort

The Rezort is a 2015 British zombie horror film directed by Steve Barker and written by Paul Gerstenberger. It stars Dougray Scott, Jessica De Gouw and Martin McCann. After humanity wins a devastating war against zombies, the few remaining undead are kept on a secure island, where they are hunted for sport. When something goes wrong with the island's security gates, the zombies attack the guests and the world faces the possibility of a new outbreak.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.