Optimum Releasing have sent us the brand new poster the horror/thriller F.

Johannes Roberts’ new film premiered a FrightFest, where it was met by highly enthusiastic reviews, mostly praising it’s gritty, twisted take on the British horror genre.

A group of teachers must defend themselves from a gang of murderous kids when their school comes under siege after hours.

F features performances from David Schofield, Eliza Bennett, Juliet Aubrey, Finlay Robertson, Emma Cleasby and Ruth Gemmell.

Check out the new poster below and click to enlarge:

F will be released in the UK on September 17.