Andrew Mitchell with his bike
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'Plebgate' affair: Police officer to sue Andrew Mitchell

4 December 2013 Last updated at 12:58 GMT

The police officer at the centre of the Plebgate row is to sue the Tory MP and former cabinet minister Andrew Mitchell for libel.

PC Toby Rowland was on duty at Downing Street when Mr Mitchell tried to ride his bicycle through the main gate in September 2012.

Tom Symonds reports.