★★★★

Already the subject of three landmark  documentaries – not least the BBC’s seminal 1989 short John’s Not Mad – the remarkable and often gut wrenching story of John Davidson finds dramatisation this week in Kirk Jones’ I Swear. All emotion lives here. The tears, both joy and despair, are constant. Sure enough, this is a film that grabs you by the heart with astonishing ease and offers little let up. A deeply human script from Jones himself is triumph enough but it’s the powerhouse performances before the camera that nail the landing.