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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Some mist and hill fog tonight. Brightening up on Thursday.
Overnight, low cloud, fog, drizzle. Thursday, warm, sunny spells developing.
A cloudy start, but turning fine and warm later.