PC Marc Horsewood from Lincolnshire Police speaks to ITV News about the importance of the march in London.
He is just one of up to 20,000 police officers from forces across England and Wales travelling to London today.
This is the first police march in the capital for more than four years.
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Thousands of people turned up at Wollaton Park yesterday for the festival, which was headlined by Kaiser Chiefs.
Specially-trained prison security teams were sent to HMP Hewell near Redditch, after trouble broke out on one of the prison's wings.
Scattered showers will develop through the late morning with some heavy, perhaps thundery downpours.