The police officer at the centre of the 'Plebgate' affair has filed a defamation case against former Tory Whip Andrew Mitchell, the Metropolitan Police Federation has confirmed.
Pc Toby Rowland, who has made the claim, was the officer on the Downing Street gate when Mr Mitchell was forced to push his bike through the pedestrian exit.
Mr Rowland's account of the altercation that followed differs from that of Mr Mitchell, but the Crown Prosecution Service decided there was not enough evidence to show which one was correct.
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The annual event has earned a place in the record books ahead of the grand final of the 60th anniversary show in Austria this evening.
Local authorities said the move is necessary to "avert the growing number of deaths and increasing harm linked to psychoactive substances".
Some students argued that the centuries-old tradition of wearing gowns, suits and mortarboards to exams was 'archaic' and looked elitist.