On Friday, the Met Police also said that an "urgent examination" was underway to review all current investigations of sexual and domestic abuse allegations against officers and staff.

The Met's commissioner, Dame Cressida Dick, previously announced a review of the force ’ s "standards and culture".

Baroness Casey was the UK's first victims' commissioner and ran the troubled families programme.

Casey said : "Trust is given to the police by our, the public's, consent.

So any acts that undermine that trust must be examined and fundamentally changed.

"This will no doubt be a difficult task but we owe it to the victims and families this has affected and the countless decent police officers this has brought into disrepute."

She added : "We recognise the grave levels of public concern following the kidnap, rape and murder of Sarah Everard and other deeply troubling incidents and allegations.

The phone number may be 888 and can be used to provide emergency assistance for women who feel threatened

i have said that we know a precious bond has been broken.

The review is separate to a public inquiry announced by Priti Patel on Tuesday that will look at how Wayne Couzens was allowed to remain in the police and "wider issues" raised by the case.

The Metropolitan Police announced a series of other measures in response to the killing and wider concerns about violence against women and girls.

The Met also announced a "root and branch" review of the parliament and diplomatic protection command, focusing on recruitment, vetting, culture, professional standards and supervision.

The new phone number is a response to the brutal murder of Sarah Everard who was raped and killed by a serving member of the Metropolitan Police

He added : "It's now or never for policing to change.

We all want confidence in policing."

The Mail reported the new "walk me home" service could be in operation by Christmas, potentially with the number 888.

BT, which runs the existing 999 service, has submitted proposals for a mobile app that would allow people to have their journeys tracked, with an alert to make sure they have returned home.

Wayne Couzens, pictured, was handed a whole life sentence for the murder of Ms Everard

"This new phone line is exactly the kind of innovative scheme which would be good to get going as soon as we can.

i'm now looking at it with my team and liaising with bt. '

under the plans, users would be able to call or text 888 to give an estimate of how many minutes they expected to take to get back to their home address or other safe destination.

Their journey would then be tracked using GPS and the app would send a message to check that the user has made it home safely – a failure to respond would lead to emergency contacts being alerted.

BT CEO Philip Jansen, pictured, believes the new phone line could help women who feel threatened while walking on the street

"it's very rare that people get kidnapped, raped and murdered, and the whole story is just awful.

But what is not rare is the number of people who feel worried or fearful on a walk home," Mr Jansen said.

'it happens every day in massive numbers, with people walking by themselves, looking over their shoulder, constantly worried."

mr jansen acknowledged there would be complications with privacy and misuse : 'what we don't want is a load of calls to the police that would be a waste of time.

Priti Patel, pictured, has authorised a plan to start a phone number and app which could be used to summon help to women walking home who are feeling threatened

a home office spokesperson confirmed to the independent it had received bt's proposal and would respond in due course.

'as set out in our strategy earlier this year, we need a whole of society approach to tackling violence against women and girls and welcome joint working between the private sector and government," the spokesperson said.

It was announced yesterday that Louise Casey will lead a review into sexual misconduct allegations involving serving Met officers.

The crossbench peer will investigate the culture of Britain's largest police force and assess leadership and vetting processes in the wake of Miss Everard's murder.

Part of the review will involve re-examining cases of sexual misconduct from the past ten years.

the review, which is expected to take six months and the met said it would be made public.

Philip Jansen, the company's chief executive, told the Daily Mail he was prompted to work on the idea by the murders of Ms Everard and Sabina Nessa.

We are proposing to build into it a new emergency service that would complement 999.

He added that the app could help to prevent people from going missing for hours before the alarm is raised and could help to deter criminals, who would know that friends and family could be alerted within minutes.

"there needs to be proper discussion and debate about the technicalities, but i am confident that we can make it work," the telecoms boss said.

I am not a politician, I can't change society, but if I can use innovative technology to improve personal safety, then I am determined to do so.

Dick announced the review on Monday, only for the home secretary, Priti Patel, the next day to announce the government was launching its own inquiry.

Ms Everard was killed by an officer who used his police-issue handcuffs and warrant card to stage a fake arrest in order to kidnap her.

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