Blair has bred a generation of career cops, says Ghaffur
Tarique Ghaffur accused "career policemen" of being "serial fraudsters" more interested in management than traditional policing.
The former assistant commissioner left the Met with a £280,000 pay-out in return for dropping a race and age discrimination claim he brought against Sir Ian.
But in an article in which Mr Ghaffur launched a savage attack on his former boss, he also claimed the top levels of Scotland Yard had been damaged by his regime.
Mr Ghaffur, who was the country's highest ranking Asian officer, accused his former boss of being a "terrifically arrogant man".
He said: "He has bred a generation of officers who, like him, are focused on fulfilling performance targets.
"This new breed of career cop secures one job and then immediately starts plotting their next promotion - they are nothing more than serial fraudsters.
"Sadly those who are simply too busy saving lives and solving crime are overlooked."
He claimed that under Sir Ian, Scotland Yard had become bogged down with systems, processes and procedures.
"Instead of being visible in our communities, we were all in meetings."
Mr Ghaffur said Sir Ian was guilty of two things: "First, that he transformed the Yard into a corporation, almost too busy running itself to fight crime; and second, he politicised the force, putting it in the pocket of New Labour."
He also warned that the security budget for the 2012 Olympics needs to be doubled if it is to be safe from terrorist attack. Mr Ghaffur said he was sidelined from the job after challenging the £600 million that was originally allocated for security, describing it as "patently plucked out of thin air". He said he believed the budget should actually be £1.2 billion.