How did the officer who wrote it know what was in the police log?

BBC: Why the Andrew Mitchell 'plebgate' story matters

The Dutch nongovernment group guesstimates that there are three unreported cases for every one recorded in a police log.

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The officer concerned reported the incident to his superiors and the official police log, which appeared to contradict Mr Mitchell's story, was later leaked to the media.

BBC: Andrew Mitchell

Sir Bernard Hogan-Howe said it had "yet to be proven" whether a police log of an argument between the ex-chief whip and officers outside No 10 was true.

BBC: UK Politics

What began as a story about what was really said became a story about who leaked a police log but it is now much more serious than that.

BBC: Why the Andrew Mitchell 'plebgate' story matters

The commissioner said Scotland Yard's inquiry had still not determined who had leaked the story to the papers, nor whether a police log of the incident which appeared in the Daily Telegraph was genuine.

BBC: UK Politics

The email was sent before any account of what happened reached the media and yet is remarkably similar to the police log both in the events it describes and the phrases it alleges Mr Mitchell used.

BBC: Why the Andrew Mitchell 'plebgate' story matters

The group of MPs said they were "surprised" that Sir Jeremy did not seek to verify the accuracy of a document purporting to be the police log of the altercation which was published in the Daily Telegraph.

BBC: 'Plebgate': MPs rebuke top civil servant over row

He admitted he had not seen the police log of the incident when he gave a BBC radio interview on 21 November in which he backed the officers involved and had merely seen a report about what the officers had seen.

BBC: UK Politics

Each carries a pocket notebook to log all incidents, which could later be used to help a police investigation.

BBC: Makeover for the men in black