Glynn Brown was told that cameras had never been switched on despite being present throughout wards at Muckamore Abbey Hospital, in Northern Ireland.

In fact, the cameras had been recording for six months without staff knowing. In all, they captured 300,000 hours of footage which is reported to show appalling abuse and cruelty against patients – many of whom are non-verbal and have complex needs. File on 4 Investigates has spent months examining what happened and highlights how – eight years on from the discovery – no criminal cases have yet come to trial. It also considers why the scandal has not drawn more public outrage, and what lessons are being learned to protect patients elsewhere?

Reporter: Noel Titheradge

Producer: Fergus Hewison

Technical Producer: Nicky Edwards

Production Coordinator: Tim Fernley

Editor: Richard Vadon