THE Swindon founder of an anti-bullying charity that has pitched Gordon Brown into a political storm was last night threatening more revelations.

Christine Pratt claims the National Bullying Helpline had been contacted over complaints about bullying at 10 Downing Street.

And she warned of more disclosures despite accusations that she has breached the confidentiality of people who approached her.

She insisted she had not been influenced by the Conservatives, whose South Swindon headquarters in Dorcan is located two doors from that of the helpline.

“This is not politically driven,” she said. “The locality of the two buildings is entirely coincidental. I’m not a member of the Conservative party.”

“I haven’t breached confidentiality. I came forward and spoke to local media after the dismissive approach from Lord Mandelson saying there was no bullying going on.”

Mrs Pratt did not rule out make public more details of what the three or four Downing Street staff revealed to her.

But she was forced on the defensive after it emerged she had been in contact with Conservative politicians about claims of mistreatment in Downing Street.

Also in a blow for the helpline, the decision to publicise the allegations on Sunday prompted the resignation of three of the charity’s patrons.

TV presenter Sarah Cawood followed Professor Cary Cooper in stepping down.

Then last night Tory MP Ann Widdecombe resigned saying she had concerns about a breach of confidentiality over claims of Downing Street bullying.

Ms Cawood, in a statement issued by her agent, said: “In light of the recent events where confidential phone calls were made public, I feel it is no longer a campaign with which I would like my name to be associated.”

Prof Cooper, an expert on workplace stress, said: “One of the things that is really important for any helpline or any counselling service is to retain confidentiality of the people calling up.”

The Charities Commission, the regulating body of charities across the UK, said it was considering whether to investigate dozens of complaints made against the helpline since the weekend.

Meanwhile, Mrs Pratt was forced to admit that the charity routinely referred callers to a consultancy run by her husband David, known as HR & Diversity Management.

She insisted the arrangement had been properly approved and “thoroughly vetted” by the Law Society.

The links between HR & Diversity Management and Tory-led Swindon Council were unclear last night. The company appeared to list the council as one of a number of organisations with which it had worked.

But a council spokeswoman told the Advertiser: “To the best of our knowledge we have not worked with the company.”

Questions were also raised over the charity’s political links after it emerged that Tory leader David Cameron had provided a message of support for the organisation that featured prominently on its website, and its patrons included Conservative MP Ann Widdecombe and a Conservative councillor in the London Borough of Hillingdon.

South Swindon MP Anne Snelgrove, who hosted the launch of the National Bullying Helpline in the House of Commons but severed links with Mrs Pratt after receiving complaints in 2008 about the way the helpline was run, said: “She needs to get all this evidence to Number 10, if she has it, and make sure it’s dealt with.

Mrs Snelgrove, who is also the Prime Minister’s parliamentary private secretary, added: “I’m extremely sad that the National Bullying Campaign has been dragged into this.

“I fail to understand why Christine didn’t take this information to the civil service when she first got it.”

Members of the Government also joined in the criticism of Mrs Pratt.

Business Secretary Lord Mandelson said: “I just think it’s really, really unfortunate that somebody should use a charity in this way.

“You do have to ask yourself why she isn’t more sure of her ground, why she isn’t clear in the allegations she is making, and why she isn't able to produce more evidence for the points that she’s making.”

Lord Mandelson said people making allegations about Mr Brown’s behaviour needed to “put up or shut up”.

“We need some evidence to back up this sort of claim. We haven’t seen it,” he said.

Mrs Pratt said yesterday while she had received phone calls of support from Tory MPs they were “irrelevant” in the context of her speaking out.

Asked if the Conservative Party had been in contact with her over the allegations, she replied: “Yes. I have been in touch with them, they have been in contact with us but we are not a political charity, I’m not politically motivated. We received a call of support from local MPs but that is irrelevant.”

Mrs Pratt’s claim that her charity’s helpline received a number of calls and emails from concerned Downing Street staff, including one in recent months, came amid suggestions in a new book – strongly disputed by No 10 – that the Prime Minister had been warned over his behaviour.

Tory leader David Cameron called for an inquiry into allegations of bullying in Downing Street, saying: “These are very serious matters.

“I’m sure that Number 10 Downing Street and the civil service in some way will want to have some sort of inquiry to get to the bottom of what has happened here.”