Lift is a documentary with an unusually simple premise: what happens when a filmmaker sets up a camera in an average London tower block lift? The results are engrossing: as the project progresses, residents begin to confide in the filmmaker in remarkably personal and often amusing ways. With humour and candour, this film by the UK director Marc Isaacs touches on questions of trust, the way the camera can transform a situation, and the usually hidden lives of everyday people.