He was appointed an adviser on race issues to the Home Secretary, and then transferred to the Metropolitan Police Service (MPS) on promotion to Superintendent on 29 March 1999 as a staff officer to Assistant Commissioner Ian Johnston.

Before publication, the MPS issued a statement noting that it "considers it a matter of regret that Chief Superintendent Dizaei has felt it necessary to write this book", and reiterating its support for the Helios team.

In November 2007, Stephen Otter, then the Chief Constable of Devon and Cornwall, successfully sued Dizaei and the publishers of his book ″Not One of Us″ for libel.

Otter had given false evidence as a prosecution witness during proceedings against Mr. Dizaei at an Old Bailey trial for perverting the course of justice - which resulted in his acquittal.

At a hearing in the High Court of Justice, Dizaei, his co-author and book publisher, admitted that "there was no basis to suggest that Mr.

In addition to the apology, Dizaei, his co-author and publisher agreed to make a substantial donation to a charity of Otter's choice and to pay his legal costs.

In 2008, Dizaei commenced Employment Tribunal proceedings against Catherine Crawford (the Chief Executive of the Metropolitan Police Authority), Sir Paul Stephenson and others, claiming that they had specifically targeted him for being an outspoken critic of their record on race and for Dizaei supporting Assistant Commissioner Tarique Ghaffur in his race discrimination claim against Paul Stephenson and Ian Blair.

[19] On 12 September 2008, the MPS announced that Dizaei was the subject of a complaint alleging that he had improperly advised solicitors defending a woman accused of a fatal hit-and-run accident.

[21] In September 2008, he was accused by the Metropolitan Police Authority of using his corporate credit card inappropriately and his conduct was investigated by the Chief Constable of Dorset and the IPCC.

[22] In September 2009, Dizaei won a High Court action against the Daily Mail and the Evening Standard over a defamatory article published in June 2008.

[23] On 27 December 2009, Dizaei accepted a substantial payment and an apology from the News of the World for allegations arising from an investigation by Mazher Mahmood.

The paper backed down and apologized in the face of legal action from Dizaei, after Mahmood claimed the officer "employed an illegal immigrant as his right-hand man and took him to the heart of the British establishment."

A 24-year-old web designer, Waad al-Baghdadi, claimed that Dizaei had not paid £600 for a website he had commissioned and when Baghdadi confronted him about this, a public quarrel ensued.

On 21 May 2009, the Crown Prosecution Service announced that Dizaei faced two criminal charges of misconduct in a public office and perverting the course of justice.

In a statement, the NBPA said: "It is outrageous that the CPS, for the second time in four years, has commenced a prosecution against the president of the National Black Police Association, Commander Ali Dizaei.

[36] On 27 June 2011, the key witness in the quashed conviction of Dizaei, Waad Al-Baghdadi, was charged with benefit fraud (in excess of £27,000), which included false disability claims in the name of his deceased father.

[44] One prosecution witness, Waad Al Baghdadi, told the jury that he had recently been released from prison for claiming over £27,000 in the name of his dead father.

[45] On 25 January 2012, the prosecution adduced medical evidence suggesting that Dizaei had faked physical injuries to make it look like he had been assaulted.

Dizaei said he had warned Mr Baghdadi and asked him to leave but arrested him due to his continued abuse and threatening behavior.

He said British authorities knew he had lied about his past and was a benefit cheat – but were still happy to use him as the key witness to convict Dizaei.

[53] Between 2000 - 2001, Andy Hayman (former Assistant Commissioner of the Metropolitan Police) permitted Dizaei's telephone calls to be intercepted and transcribed as part of Operation Helios.

[58][59][60][61] In 2014, Dizaei formed Covert Security Limited, an international investigations consultancy specializing in tracing and locating assets and individuals and carrying out cold-case reviews.