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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Newark castle was bombarded with cannon fire this weekend as visitors flocked to the opening of the UK's first Civil War museum.
A mostly fine and dry day.
Drier and brighter today but becoming wet tonight.