British policing resources have been "drained to dangerously low levels", five ex-Met Police chiefs have warned.
The former commissioners, who ran London's police force from 1993 to 2017, said cuts had "contributed to the feeling of lawlessness" generated by knife crime and county lines drugs.
They called for a royal commission on policing and the possible ending of the "fragmented" system of 45 area forces.
In
a letter to The Times newspaper, the former Scotland Yard chiefs - and three other former senior officers - said there had been an "emasculation of British policing" in recent years.
They said the loss of more than 30,000 officers and support staff in recent years had left the public with "perilously low expectations".
The cuts, along with the "virtual destruction" of neighbourhood policing and the "undermining" of powers - such as stop and search, had taken their toll, they said.
The retired officers said the next prime minister will "inherit the urgent task of restoring confidence".
But they did not believe it could be restored by what they describe as a "fragmented" system of territorial forces.
Labour MP Yvette Cooper, who chairs of the home affairs select committee, said the "damning" letter revealed a "desperate need for more police".
In their letter, the retired officers call for a royal commission - essentially a government-appointed advisory committee - to investigate the state of British policing.
Sir Mark Rowley, who signed the letter and was assistant commissioner in Metropolitan Police between 2011-18, said: "We're saying it needs a fresh look at a national level in terms of how to organise policing to deal with the threats of today."
The letter criticised police and crime commissioners, saying they did not have the skills or resources to address the problems.
Sir Mark told BBC Radio 4's Today programme: "Having one person overseeing a massive organisation, there's no base in governance for that. You don't have boards of companies which is just one person on their own."
He said such commissioners had "fairly unchecked powers" in how they seek to direct the police.