Lord Levy last night claimed he was the victim of a smear campaign by unnamed figures who wanted him to be the fall-guy of Scotland Yard's cash-for-honours inquiry.

Tony Blair's chief fundraiser delivered an angry riposte to claims he had encouraged another suspect in the police investigation to change her evidence. As the 61-year-old peer was thrust yet again into the spotlight, he complained of being the victim of a "media-style trial".

The latest twist in what one MP dubbed "a soap opera of an investigation" came after the Guardian successfully defeated an attempt by the Attorney General Lord Goldsmith to halt a story in which it said detectives were investigating whether Lord Levy urged Ruth Turner, the Prime Minister's gatekeeper, to "shape the evidence" she gave to the police.

Later, a High Court ban that prevented the BBC running the story last Friday was lifted because effectively it had appeared in the newspaper.

Nick Robinson, the corporation's political editor, said: "Ruth Turner wrote a document in which she expressed her concern that Lord Levy had put to her a version of events which she believed to be untrue."

He said the BBC had not seen the document but had been told about it by more than one source, one of whom said Ms Turner, 36, had wished to draw her concern to the attention of Mr Blair and Jonathan Powell, his chief of staff.

The fierce attack on the integrity of Lord Levy prompted an indignant response from Neil O'May, his solicitor, who in a statement insisted the Labour peer "categorically denies any wrongdoing whatsoever".

Mr O'May added: "All the reports appear to be based on second-hand information given by someone or some people who are intent on smearing Lord Levy."

Earlier, Mr Blair was asked about his confidence in Ms Turner and Lord Levy. He replied: "I have got absolutely nothing whatever to say on this issue."

Ms Turner has been arrested twice, once under suspicion of perverting the course of justice, and Lord Levy has been arrested twice, once under suspicion of conspiracy to pervert the course of justice.

Both deny any wrongdoing.