In December 2012 Channel 4 Dispatches revealed the CCTV footage of the 'plebgate' incident that cast serious doubt on the police's version of events. We exposed that an email sent by a member of the public claiming to be an eye-witness was a fake and was in fact sent by a serving police officer of the Diplomatic Protection Group who wasn't in Downing Street at the time. Since then the highest ranking police officer and the most powerful civil servant in the country have been called before Parliament to account for their failure to discover what really happened and who was responsible. Now Dispatches tells the full story of plebgate. We have the first interview with Andrew Mitchell since the revelations and reveal fresh evidence of information known by key individuals at the time.