The boss of Britain's care watchdog has branded the BBC Panorama footage of member of staff at The Old Deanery appearing to slap a partially-paralysed woman as "unacceptable".
The new chief inspector of social care at the Care Quality Commission (CQC), Andrea Sutcliffe, said she was "shocked and really angry" about the poor care exposed on the programme.
The investigation by the Panorama crew, to be screened tonight, also shows shocking footage of a woman in her 90s at the 93-bed £700 a week home being slapped by a carer.
Ms Sutcliffe said: "My heart goes out to those affected and to the hundreds of thousands of good care workers who had been let down by the small minority".
"People shouldn't be getting into this business if they don't care."
However, the CQC gave the care home a clean bill of health after an inspection in November last year.#
Eight staff members were immediately suspended and one has since been sacked after concerns were raised by a "whistleblower", who later turned out be an BBC Panorama reporter.
The Old Deanery was placed into special measures by Essex County Council, and last month another report by the CQC showed "providing care, treatment & support that meets people's needs" and staffing categories of the report did not meet the standard set by the Government body.
Other victims, secretly filmed by a BBC Panorama reporter, showed residents being verbally abused and taunted by staff.
The footage, to be aired on Panorama tonight, will show a woman slapped by a care worker, and another woman, who was ignored as she asked for help to use the toilet.
The footage also reveals one elderly woman being told by carers she was "a vicious, nasty old lady".
Another resident was also left lying in his own excrement for hours at a time.
August Equity took over management of the home in November last year, when these concerns were first raised and issued new guidelines to staff.
A further 11 whistleblowers had made allegations of poor care and mistreatment as far back as August 2012.
Undercover Panorama reporter Alex Lee said she saw, "many good care workers trying their best", but also saw some staff, "mock, goad, taunt, roughly handle and ignore" elderly residents and "some were even left in their own mess for hours".
The Old Deanery management was keen to stress that as a result of the Panorama footage no residents have been removed from their care by relatives and that until they can view the full BBC evidence little direct action can be taken.Panorama: Behind Closed Doors: Elderly Care Exposed will be shown on BBC One tonight (April 30) at 9pm.
