A former MP falsely accused of being part of a VIP paedophile ring has branded a review of how detectives handled the claims as “a whitewash”.
The police watchdog identified “organisational failings” but cleared five detectives of misconduct.
Harvey Proctor said its report was “a pathetic attempt to excuse the police for their mistakes” and “negligence”.
The Independent Office for Police Conduct (IOPC) said its work was “thorough” and “detailed”.
In its report, published on Monday, the IOPC found no evidence of misconduct but said the investigation “revealed gaps and shortcomings where there is room for improvement”.
It made 16 recommendations to avoid mistakes being repeated, including on search warrants and ensuring allegations are investigated objectively.
No officers were prosecuted or disciplined for their part in Scotland Yard’s £2.5 million Operation Midland, which investigated bogus claims made by Carl Beech, previously known as “Nick”.
Beech, 51, from Gloucester, was jailed for 18 years for his false accusations.
The claims prompted searches of the homes of three prominent people – Mr Proctor, D-Day veteran Lord Bramall and Lady Diana Brittan, the widow of former home secretary Leon Brittan.
In a 2016 report into Operation Midland – which was partly published by Scotland Yard last week – retired High Court judge Sir Richard Henriques found the searches “should not have taken place”, were “unlawful” and that police “misled” the magistrate who approved them.
But the IOPC investigation found no evidence the five officers investigated had deliberately misled the judges.
Sir Richard said the IOPC report into the inquiry was “flawed” and “fell well short of an effective investigation”.
Mr Proctor said the IOPC was “not an independent body that the public can trust” and called on the home secretary to abolish and replace it with “experts who are genuinely qualified to assess and to criticise police failings”.
The former Conservative MP said the IOPC report attempted to excuse police mistakes “by saying they acted in good faith”, with the intention of maintaining public confidence in the aftermath of the Jimmy Savile abuse scandal.
“But this is not acting in good faith – it is acting to interview under caution and search the homes and office of people without evidence in order to help public relations,” he said.
Mr Proctor’s lawyer Geoffrey Robertson QC said this was an “improper motive” and it was “outrageous that the IOPC should think it is a valid excuse for accusing innocent men of heinous crimes or misleading a judge to obtain a search warrant for their homes”.
In his report, IOPC director general Michael Lockwood said: “Did the officers involved make mistakes? Yes. Could police processes have been improved? Almost certainly. But did they deliberately exclude information to secure the warrants? Our investigation found no evidence of that.”
There must be public accountability and assurance in future, he said, that the weaknesses identified were addressed so mistakes were never repeated.
The IOPC’s recommendations included considering whether to record court hearings involving applications for search warrants and renewing efforts to balance the culture of believing victims when an allegation is made with the need to investigate claims objectively.
Writing in the Daily Mail newspaper, Sir Richard said the police watchdog embarked upon a “lamentably slow and inadequate process” in reviewing the work of five Metropolitan Police detectives involved in obtaining search warrants.
He wrote: “Who guards the guards themselves? Who watches the watchers? A malfunctioning police force has not received the necessary oversight.”
“The home secretary will wish to address these shocking failures,” he added.
Sir Richard said the officers’ belief that Beech had “remained consistent” in his accounts of sexual abuse was incorrect and that police “failed to disclose seven factors that undermined Beech’s credibility”.
He added that he had only been contacted after 20 months, and told that two of the five officers under investigation had already been cleared.
The IOPC continued to investigate three officers, but they retired before it published its findings.
Sir Richard said he was “alarmed by the [IOPC’s] lack of knowledge of relevant criminal procedure”.
He added: “I readily conclude that one or more of the five officers may not have committed misconduct in the application for warrants.
“However I find it difficult to conceive that no misconduct or criminality was involved by at least one officer.”
The IOPC said its review of the officers’ work “was not a cursory exercise” and “independent and impartial”.
It reviewed over 1,800 documents and 300 statements, gathering 14 independent witness accounts and accounts from three officers who were under investigation, a spokesperson said.
“As Sir Richard writes ‘no subject should be tried without proper investigation’. And, as he acknowledges in his own review, the IOPC is the right and correct authority to do this,” the spokesperson added.
Last week, the Met’s deputy commissioner Sir Stephen House said that he was “deeply, deeply sorry” for the pain caused by the Met’s “serious mistakes” during Operation Midland but that the force did not accept everything in Sir Richard’s report.
Home Secretary Priti Patel has ordered an inspection by the chief inspector of constabulary, following Sir Richard’s review.