Metropolitan Police officers will not attend emergency calls if they are linked to mental health incidents from September.

According to The Guardian newspaper, the force’s commissioner Sir Mark Rowley has written to health and social care services to say police will no longer attend after August 31 unless there is a threat to life.

The move is designed to free up officers to spend more time on their core roles, rather than dealing with patients in need of medical help from experts.

A statement from the Met Police to The Guardian said: “Where there is an immediate threat to life, officers will continue to respond.

“In the interests of patients and the public, we urgently need to redress the imbalance of responsibility, where police officers are left delivering health responsibilities.

“Health services must take primacy for caring for the mentally ill, allowing officers to focus on their core responsibilities to prevent and detect crime, and keep communities safe and support victims.”

A Met Police spokesperson told the BBC police spend an average of 10 hours with a patient when they are sectioned under the Mental Health Act.

They said: “In London alone, between 500-600 times a month, officers are waiting for this length of time to hand over to patients, and it cannot continue.

“Police are compassionate and highly skilled but they are not trained to deliver mental health care.”

Humberside Police introduced a similar policy, known as Right Care, Right Person (RCRP) in 2020, with mental health professionals dealing with calls.

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An inspection by His Majesty’s Inspectorate of Constabulary, Fire and Rescue Services in November found the switch had saved the force – which has mental health workers from the charity Mind in the force control room – 1,100 police hours per month and said the public received “more timely care from the most appropriate care provider”.

The Met spokesperson said the programme had been “hugely successful… reducing demands on all services and, most importantly, ensuring the right care is being delivered by the right person”.

The RCRP programme is designed to be rolled out national, but the commissioner is believed to have run out of patience and believes “the status quo is untenable”.

In his letter, seen by The Guardian, he writes: “I have asked my team that the Met introduce RCRP this summer and withdraw from health-related calls by no later than August 31.

“It is important to stress the urgency of implementing RCRP in London. Every day that we permit the status quo to remain, we are collectively failing patients and are not setting up officers to succeed.”

He continued: “We are failing Londoners twice. We are failing them first by sending police officers, not medical professionals, to those in mental health crisis, and expecting them to do their best in circumstances where they are not the right people to be dealing with the patient.

“We are failing Londoners a second time by taking large amounts of officer time away from preventing and solving crime, as well as dealing properly with victims, in order to fill gaps for others.

“The extent to which we are collectively failing Londoners and inappropriately placing demand on policing is very stark.”

He said the force received a record number of 999 calls on April 28-29, but only 30% of them were “crime related”.

Former Inspector of Constabulary Zoe Billingham, who is also chairwoman of NHS mental health services in Norfolk and Suffolk, said that the change was “potentially alarming”.

“I think it would be really, really dangerous if the police were just to unilaterally withdraw from attending mental health crisis calls right now,” she told BBC Radio 4’s Today programme.

“I don’t think that that’s what’s on the table, but we need to be careful how this plays out to members of the public because of course come the end of August, if your loved one is in mental-health crisis, there’s going to be a terrible quandary.

“You’re going to be worried about calling 999 but on the other hand, they will be simply no one else that you can call, because the infrastructure won’t be in place.”

It was a complex issue, she said, and while there were alternative models to reduce reliance on police all required significant investment.

“It requires infrastructure. It requires resources. And I’d be very surprised if every single mental health trust in London has got all of that up and running by August.”

Sarah Hughes, chief executive of Mind, expressed similar worries and called on the NHS and the Met to “urgently” sit down and work out a plan.

“I am not persuaded we have got enough in the system to tolerate a shift to this new approach. I think we’ve got a huge way to go before the system is working together on behalf of very distressed individuals,”