The synopsis, per Fandango, as is follows:
"Two Cockney siblings lead the residents of a quiet retirement community in a bloody war against the undead in this horror comedy from director Matthias Hoene. Andy (Harry Treadaway) and Terry (Rasmus Hardiker) were in the middle of robbing a bank to save the rest home where their grandfather lives when the zombie apocalypse struck East London. After arriving at the nursing home heavily armed and with cash in tow, the two brothers prepare to fight their way out with the assistance of some trigger-happy seniors. Michelle Ryan and Honor Blackman co-star."Horne talked about what inspired him to make the film, the biggest hurdles and challenges he faced, his upcoming sci-fi project, and our cultural affinity for the supernatural.