The Head of the BBC, George Entwistle, on Tuesday denied helping to cover up a sex scandal involving one of his former stars.
He, however, accepted that the British Corporation had been damaged by a crisis that had shaken public trust in a national institution.
Entwistle, who took charge of the media organisation in August, told hostile lawmakers that failures at the BBC had allowed Jimmy Savile, once one of Britain's top TV presenters, to prey on young girls for years.
He said he could not rule out suggestions that a paedophile ring might have existed at the state-funded BBC during the height of Savile's fame in the 1970s and 80s.
Entwistle, however, rejected claims that BBC bosses had tried to hide allegations against Savile, who died last year, or suppressed an inquiry by one of their own news programmes.
“This is a gravely serious matter and one cannot look back at it with anything other than horror,” Entwistle told parliament's Culture and Media Committee.
“There is no question that … the culture and practices of the BBC seemed to allow Jimmy Savile to do what he did, which will raise questions of trust for us and reputation for us.”
Police are investigating allegations that Savile, who hosted prime time children's shows on the BBC, abused women, including girls as young as 12 over six decades at the BBC premises.
Detectives announced a criminal inquiry into the claims on Friday, saying more than 200 potential victims had come forward.
The furore over Savile is the biggest controversy to hit the BBC since its Director General and Chairman resigned in 2004 after a judge-led inquiry ruled it had wrongly reported that former Prime Minister Tony Blair had “sexed up” intelligence to justify the 2003 invasion of Iraq.
It comes as British newspapers await the recommendations of a separate inquiry into journalistic ethics following a phone-hacking scandal at Rupert Murdoch's now closed News of the World tabloid.
The BBC, which holds a special place in Britons' affection and is paid for by a tax on viewers, had been under growing pressure since rival channel ITV exposed Savile's alleged crimes three weeks ago.
The most damaging aspect for Entwistle and senior managers was the accusation that a similar probe by the BBC's flagship “Newsnight” show was pulled a couple of months after Savile's death in October 2011 because it would clash with planned Christmas programmes celebrating his life and charity work.
Entwistle's predecessor as the BBC's Director General, Mark Thompson, who is the New York Times Co's incoming chief executive, also said he did not know about the content of the Newsnight investigation until it was disclosed this month.
Prime Minister David Cameron said on Monday the BBC appeared to be changing its reasons for dropping the story and that it had serious questions to answer.
Newnight's Editor, Peter Rippon, had stepped aside after the BBC said his explanation for shelving the story had been “inaccurate or incomplete”, and Entwistle said Rippon had been wrong not to broadcast the report.
He added: “I've been able to find no evidence whatsoever in the conversations I've had, and in the documents we've now pulled together, that any kind of managerial pressure to drop the investigation was applied.”
At the time of the Newsnight probe, Entwistle was in charge of BBC television's commissioning and programming.
He admitted the Head of News had briefly told him about it in December and that he might have to change the Christmas schedules, which included Savile tributes.
His failure to ask more questions about the Newsnight inquiry was ridiculed by some of the lawmakers, with one saying he showed a lamentable lack of knowledge.
Another likened his answers to those given by Murdoch's son James during questioning over phone-hacking when he appeared not to know what was going on within his media organisation.
“You sound like James Murdoch now,” Damian Collins said.
Entwistle admitted the BBC had taken longer to address the growing crisis than it should have but had been at pains to avoid causing any damage to the police investigation.
“We have done much of what we should have done,” he said, explaining he had ordered two independent reviews.
Asked if it was likely that sexual abuse of children and young women had been widespread at the BBC, he said: “I don't yet have enough of a picture to know whether it was endemic.”
He revealed the corporation is now investigating up to 10 “serious allegations” involving past and present employees over the “Savile period.”
He described the “Jim'll Fix It” star as a “skilful and successful sexual predator who covered his tracks”.
Former colleagues have come forward to say there had been rumours for years involving young girls and Savile, and later knighted by Queen Elizabeth for his extensive charity work.
Other BBC employees have talked of a culture at the corporation where women were groped and have hinted that Savile was not the only household name to have been involved.
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