Following the withdrawal of the most recent trial into the murder of Daniel Morgan, the Metropolitan Police and CPS have issued their joint review commissioned in March last year.
The trial judge said this case was of an exceptional scale and complexity, with over three quarters of million documents gathered over 20 years being examined.
The issues around the disclosure exercise were such that we could not guarantee that all relevant material had been identified, considered and disclosed so as to ensure a fair trial. A further factor related to the unreliability of critical witnesses.
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Sir Bernard Hogan-Howe's decision to retire comes after growing speculation about his future and his relationship with mayor Sadiq Khan.
Sir Bernard Hogan-Howe is to retire after five years as the Commissioner of the Metropolitan Police, according to Scotland Yard.
The curtain will come down on the show for the final time at the Piccadilly Theatre in March next year, before embarking on a UK tour.