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The plebgate row has clouded the public view of Scotland Yard and has taken too long to deal with, Britain's most senior police officer has admitted.
Speaking to Nick Ferrari on LBC this morning, Metropolitan Police Commissioner Sir Bernard Hogan-Howe said:
"During the time this thing has been an issue, the Met has been performing better than ever. We've just got to live with the reality - the newspaper headlines, the fact that you're talking about it, clouds the fact that crime's coming down at its fastest for 30 years.
"This issue's got to be resolved and we've got to deal with it."
He added: "We're all eager to see the outcome of this inquiry and that we get back to some kind of normality, because I think it's not good for the police and it's not good for public confidence.
I'm determined to get to the bottom of it, we've got a thorough investigation and we really now have to await the outcome of that."
Senior Conservative MP David Davis has called for police officers to wear a camera and microphone while on duty in the wake of the "plebgate" row.
Mr Davis, an ally of Andrew Mitchell and a former shadow home secretary, wrote in The Times (£) that such technology could help curb the use of force by officers and also "help to defend police officers who have vexatious claims made against them".
He said there is "a crisis of ethics" within the service and called for "root-and-branch reform of policing culture", starting with a Government-appointed Royal Commission to investigate their conduct.
"Regrettably it appears that the Mitchell case is merely a high-profile example, not an isolated one", he added.
Inspector Ken MacKaill, Detective Sergeant Stuart Hinton and Sergeant Chris Jones were accused of lying about what Andrew Mitchell said in a meeting at his Sutton Coldfield constituency office held nearly a month after the so-called "plebgate" row erupted.
A transcript shows Mr Mitchell apologised for swearing at the police officers but denied using the word "plebs", while in comments made after the meeting Mr MacKaill claimed the former Tory chief whip refused to provide an account of the incident.
The officers, who were representing the forces of West Mercia, Warwickshire and West Midlands, were spared misconduct proceedings by an internal investigation.
But the Independent Police Complaints Commission (IPCC) later disputed the findings and said there were issues of "honesty and integrity" among the three men.
The federation representatives will give evidence to the Home Affairs Select Committee before the chief constables from all three forces - Andy Parker of Warwickshire Police, David Shaw of West Mercia Police and Chris Sims of West Midlands Police - also appear.
Three police officers caught up in the so-called Plebgate row are to be grilled by MPs later.
Police Federation representatives Inspector Ken MacKaill, Detective Sergeant Stuart Hinton and Sergeant Chris Jones were accused of trying to discredit former Tory chief whip Andrew Mitchell after meeting him in October last year.
Mr Mitchell met the three officers after he was accused of calling officers guarding Downing Street "plebs" in a foul-mouthed rant as he was asked to cycle through a side gate on September 19 last year.
Latest ITV News reports
The Chief Constable of West Mercia Police has offered an "unreserved apology" to ex-Chief Whip Andrew Mitchell over the 'Plebgate' meeting.
West Mercia Police chief constable has overturned a ruling that three officers who met Andrew Mitchell had no case to answer for misconduct.