The police officer at the centre of the Plebgate row has filed a legal claim for up to £200,000 in damages from MP Andrew Mitchell.

Meanwhile, Mitchell is himself continuing to sue The Sun newspaper for libel over its report of the altercation between the former chief whip and PC Toby Rowland outside the gates of Downing Street on 19 September 2012.

It is believed that only Mitchell and Rowland know the truth of the matter.