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A patron of an anti-bullying charity has resigned, saying its founder breached confidentiality by claiming Downing Street staff used its helpline.
Prof Cary Cooper, an expert on workplace stress, said on Monday he had quit the National Bullying Helplin
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But Prof Cooper told the BBC he was "really upset" and that it was "wholly inappropriate" to publicly name any employer in case it left the caller open to identification.
"[As] a helpline or counselling service you never, ever reveal anything to do with when a client calls you in any way," he said.
He said he had informed Mrs Pratt of his decision by e-mail.
Mrs Pratt has also been criticised by another charity, Bullying UK, which said it was "horrified" she had "all but identified" one caller in media interviews.
"It's hard to imagine a more serious breach of confidentiality," it said on its website.
It said it was complaining about the helpline to the Charity Commission, having received e-mails from people who thought Bullying UK was responsible, and called on Mrs Pratt to consider her position.
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