Mr Yates strongly denied briefing journalists, saying the investigation was characterised by a lot of speculation.
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
Mr Yates was jailed with a charge of blackmail ordered to lie on file.
But Mr Yates did say they had raised suspicions when they came across them in early September.
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
He asked Mr Yates why he had been so confident the probe would be finished so quickly.
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
Chairman Tony Wright asked Mr Yates straight whether he had discovered there was a "trade in peerages".
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
But Mr Yates said he had been promised immunity from prosecution if he handed the machine back.
Mr Yates rejected allegations, made by a Labour MP, that he misled Parliament over the phone hacking allegations.
Mr Yates has continued to claim that the person who did steal the machine has threatened him with reprisals.
Mr Yates said he had begun the investigation in the "spirit of cooperation" and many people "had cooperated in full".
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
Mr Yates had offered to face MPs to "rebut" claims he misled Parliament by suppressing the full extent of the scandal.
Mr Yates admitted the Metropolitan Police's reputation had been tarnished by the scandal but said he had no intention of resigning.
Appearing before the Culture Committee on 24 March 2011, Mr Yates said Mr Bryant had made "several assertions that are not correct".
Mr Yates had allegedly placed his hand over her mouth so she could not breathe but eventually she managed to calm him.
BBC: Body in boot trial: John Yates 'brutally murdered wife'
Mr Yates said the lack of consistency and transparency for nominating working peerages meant it was "very difficult" to find a way through it.
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
On whether it had helped or hindered his career, being involved in the case, Mr Yates said: "I think that's probably for others to judge".
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
Mr Yates also admitted police could have done more to catch Napper and prevent further crimes, in particular the murders of Samantha and Jazmine Bissett.
Mr Yates resigned a day later after he also came under fire for his links with Mr Wallis, the News of the World's former deputy editor.
Mr Yates was questioned about the necessity for dawn raids and "beating down the door" in a case of this type, by Tory MP Charles Walker.
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
Mr Yates said a 6am arrest on a high profile person was the "least intrusive" option, arresting someone somewhere private, away from the full glare of publicity.
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
Mr Walker suggested a press officer may have leaked the information - Mr Yates said he worked with people he completely trusted to keep the information confidential.
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
Detective Superintendent Simon Chesterman, from Thames Valley Police, said there was an on-going investigation into the theft of the machine but denied any connection with the release of Mr Yates.
Mr Yates said he had been "in discussion" with the CPS throughout the inquiry to double check they were on the "right lines" and to question whether the investigation should stop.
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
Mr Yates had been on police bail following an incident 13 days earlier when he stole 35 pairs of shoes and a new dress from her home, the court was told.
BBC: Body in boot trial: John Yates 'brutally murdered wife'
Asked to define a commercial loan, Mr Yates said it was an important point, as lending money to a political party should not be a bar to being nominated for a peerage.
BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing
Mr Yates also said that "perhaps more could have been done" to investigate the allegations, which first surfaced in 2005, but rejected claims of deliberately suppressing evidence of wrongdoing by journalists and executives.
Mr Bryant said Mr Yates had misled the committee about the legal advice he received and used a narrow definition of phone hacking in order to suggest there were only a few victims.
Although the Global Alliance of Publication Professionals (GAPP) cannot answer the questions that Mr Yates posed directly to Isabelle Leach and PAREXEL, we welcome the opportunity to answer the questions you have asked.
FORBES: Industry Supported Editorial Assistance: The Debate Continues
Mr Lloyd Jones told the jury how Mr Yates had turned up in his Peugeot 306 estate at the North Wales police traffic base at St Asaph where he spoke to a chief inspector.
BBC: Body in boot trial: John Yates 'brutally murdered wife'
As well as the five individual referrals to the IPCC, there was a sixth relating to the alleged involvement of Mr Yates in inappropriately securing a job at the Met for the daughter of a friend.
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