Gerard Johnson’s gritty British thriller follows a corrupt, coke-snorting undercover policeman (the excellent Peter Ferdinando, who also starred in Johnson’s previous film, 2009’s Tony) as he becomes embroiled in a bloody turf war between rival London drug traffickers. Though Hyena never fully overcomes its lack of originality – James McAvoy played a similar role in 2013’s Filth – its depiction of the capital’s crime scene is undeniably powerful. Most impressive are Johnson’s slow-motion set pieces, which owe a debt to Nicolas Winding Refn’s Drive. Aided by a seedy synthpop score from The The’s Matt Johnson (the director’s older brother), this nasty horror sucks you into a grisly world of duplicitous cops and brutish criminals prepared to butcher anyone who gets in their way.