It was two former nurses from the hospital who took their concerns to the undercover documentary team.
Without the media exposure no one may have known the true extent of abuse at Winterbourne View.
Nurse Ashleigh Fox says managers repeatedly ignored her concerns and after just three months she resigned from her job.
Miss Fox says there was no response to her anonymous call to the Care Quality Commission and so in desperation she and another nurse Terry Bryan told the undercover documentary team what was going on. But even they were shocked by the level of abuse caught on camera.
Ashleigh Fox hopes the exposure of abuse at Winterbourne View acts as a watershed on how mental health patients are cared for.