It is essential that there is a full and independent investigation into what happened in Downing Street as we and others called for three months ago.
These very serious allegations involving a police officer must be rigorously investigated. And the full facts must be set out.
None of the reports from the Government in September raised the possibility of a witness nor is it clear whether this was checked out at the time or had any influence on events.
Britain's most senior police officer has promised a "ruthless" investigation into an alleged conspiracy against Andrew Mitchell.
Andrew Mitchell has written a piece in which he has accused the police of trying to destroy his career in a smear campaign.
Police investigating the row involving Andrew Mitchell have arrested a second man today. See how the "plebgate" events unfolded.