The care watchdog was wrong not to publish an inspection report raising concerns about Whorlton Hall, four years before a Panorama investigation suggested alleged abuse, a review says.
Former Care Quality Commission inspector Barry Stanley-Wilkinson said not publishing his 2015 report was a “missed opportunity” to prevent abuse.
Last year’s undercover filming appeared to show patients with learning difficulties being mistreated.
Ten workers were later arrested.
The County Durham hospital, which has now been closed, treated patients with severe learning difficulties and autism.
The CQC commissioned David Noble QSO to carry out an independent review into how it dealt with the concerns raised by Mr Stanley-Wilkinson’s draft inspection report and how they were addressed by senior personnel.
The unpublished 2015 report found the hospital, near Barnard Castle,