Best known for co-writing and starring in Garth Marenghi’s Darkplace, Matthew Holness goes to very dark places with his debut feature as a writer and director, Possum. Starring an unnerving Sean Harris, an equally upsetting Alun Amstrong and a human-arachnid hybrid that joins the ranks of cinema’s scariest puppets, the film’s a two-hander horror with eight limbs…
