The nursery where Vanessa George worked provided "an ideal environment" for her to prey on toddlers in her care, an official report has concluded.
The 40-year-old paedophile was jailed last year for taking photographs on her phone as she abused children at the Little Ted's nursery in Plymouth, Devon.
Plymouth City Council's Safeguarding Children Board described it as a "shocking and unprecedented case".
But it admitted that due to serious failings in Ofsted's supervisory framework similar crimes could be happening in other nurseries in the UK.
The board launched a serious case review following the arrest of the self-styled "paedo whore mum" and dozens of people were interviewed.
Its aim was to determine how an apparently respected and well-liked nursery worker was able to commit her crimes without drawing any attention.
The review concluded that a combination of weak management, poor training and a lack of external scrutiny "provided an ideal environment within which George could abuse".
And while it said no-one could have predicted George would be a risk to children, her colleagues failed to raise the alarm when her behaviour and conversations became increasingly sexualised.
George, who was a senior member of staff, even showed colleagues adult porn images on her mobile phone.
It also emerged she was never formally interviewed for the job.
"Her age, personality and length of service could have created an illusion of power and encouraged a sense of trust," it added.
"K (George) is of the ability to behave in a highly manipulative manner and hence gain high levels of trust in others."
The board recommended steps to stop similar scandals happening again, including safer recruitment procedures and effective whistleblowing procedures.
Little Teds Nursery in Plymouth
Little Ted's nursery was closed after the scandal
A number of lessons needed to be learned, it added, but "ultimate responsibility for the abuse must rest with K (George)".
Sky's Katie Stallard said the victims' parents were shown details of the report on Wednesday night and were angry with education standards watchdog Ofsted for allowing the crimes to happen.
The board's chairman Jim Gould said Ofsted's framework was not adequate to protect toddlers in nurseries.
Asked by Stallard whether there might be similar cases in other parts of the UK, he replied: "I think it would be foolish for anyone to say this could never happen again."
"We would like to see Ofsted strengthen the inspection of nurseries to ensure there is a culture in all nursery settings that maximises the safeguarding of children," he said.
Colin Blanchard
George was obsessed with paedophile Colin Blanchard
A spokesman for Ofsted said: "Today's serious case review highlights a number of areas of concern. It is important that lessons are learnt from this case.
"Ofsted has already implemented a number of changes in the way we work as a result of this review and to address the recommendations made."
These include speeding up its complaints process and improving the sharing of information with local authorities
The Department for Education said an ongoing review would consider whether standards for protecting young children need to be strengthened.
The nursery was closed in June 2009 after the abuse was discovered.
George was given an supervisory prison sentence after admitting seven sexual assaults and six counts of making and distributing indecent pictures of children.
She was told she would serve a minimum of seven years before she could be considered for parole.
She was part of a paedophile ring featuring four women and headed by known sex offender Colin Blanchard, from Rochdale, Greater Manchester.
The extent of the abuse unravelled as police investigated pornographic pictures found on Blanchard's computer by his work colleague.
The 40-year-old paedophile was jailed last year for taking photographs on her phone as she abused children at the Little Ted's nursery in Plymouth, Devon.
Plymouth City Council's Safeguarding Children Board described it as a "shocking and unprecedented case".
But it admitted that due to serious failings in Ofsted's supervisory framework similar crimes could be happening in other nurseries in the UK.
The board launched a serious case review following the arrest of the self-styled "paedo whore mum" and dozens of people were interviewed.
Its aim was to determine how an apparently respected and well-liked nursery worker was able to commit her crimes without drawing any attention.
The review concluded that a combination of weak management, poor training and a lack of external scrutiny "provided an ideal environment within which George could abuse".
And while it said no-one could have predicted George would be a risk to children, her colleagues failed to raise the alarm when her behaviour and conversations became increasingly sexualised.
George, who was a senior member of staff, even showed colleagues adult porn images on her mobile phone.
It also emerged she was never formally interviewed for the job.
"Her age, personality and length of service could have created an illusion of power and encouraged a sense of trust," it added.
"K (George) is of the ability to behave in a highly manipulative manner and hence gain high levels of trust in others."
The board recommended steps to stop similar scandals happening again, including safer recruitment procedures and effective whistleblowing procedures.
Little Teds Nursery in Plymouth
Little Ted's nursery was closed after the scandal
A number of lessons needed to be learned, it added, but "ultimate responsibility for the abuse must rest with K (George)".
Sky's Katie Stallard said the victims' parents were shown details of the report on Wednesday night and were angry with education standards watchdog Ofsted for allowing the crimes to happen.
The board's chairman Jim Gould said Ofsted's framework was not adequate to protect toddlers in nurseries.
Asked by Stallard whether there might be similar cases in other parts of the UK, he replied: "I think it would be foolish for anyone to say this could never happen again."
"We would like to see Ofsted strengthen the inspection of nurseries to ensure there is a culture in all nursery settings that maximises the safeguarding of children," he said.
Colin Blanchard
George was obsessed with paedophile Colin Blanchard
A spokesman for Ofsted said: "Today's serious case review highlights a number of areas of concern. It is important that lessons are learnt from this case.
"Ofsted has already implemented a number of changes in the way we work as a result of this review and to address the recommendations made."
These include speeding up its complaints process and improving the sharing of information with local authorities
The Department for Education said an ongoing review would consider whether standards for protecting young children need to be strengthened.
The nursery was closed in June 2009 after the abuse was discovered.
George was given an supervisory prison sentence after admitting seven sexual assaults and six counts of making and distributing indecent pictures of children.
She was told she would serve a minimum of seven years before she could be considered for parole.
She was part of a paedophile ring featuring four women and headed by known sex offender Colin Blanchard, from Rochdale, Greater Manchester.
The extent of the abuse unravelled as police investigated pornographic pictures found on Blanchard's computer by his work colleague.
NEWS BY:http://news.sky.com
