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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Very high pollen during warmer drier spells this week.
Heavy showers in the north might give a risk of thunder at first.
Lingering showers will clear through the evening as the cloud breaks.