Clive Chamberlain from Dorset Police Federation is among those taking part in the march. Officers from every police force in the country are taking part in the protest in London.
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The man behind multi-million pound 'The Black Farmer' sausage and meat brand has spoken to ITV News about his year long battle with cancer.
Chillier this evening with largely clear skies.
Mainly dry with sunny spells this afternoon.