'Pleb' row: Andrew Mitchell calls for full inquiry
18 December 2012 Last updated at 23:48 GMT
Former Chief Whip Andrew Mitchell has called for a "full inquiry" into the row with Downing Street police officers that cost him his job.
He spoke out during a Channel 4 News programme which alleged that a police officer had posed as a member of the public backing the police's story.
The programme accused the officer of falsely claiming to have seen the events in an email to his MP.
The Metropolitan Police Federation has strongly denied any "conspiracy".
Newsnight's David Grossman reports.