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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David Cameron said the Met proved it can "do more with less" and declined to criticise the Mayor of London for his water cannon spend.
A group of disabled activists threw toys and balls at him as he entered the conference.
A wet start to the week and the unsettled weather is set to continue over the next few days.