Michael Foster, chairman of trustees for COPS (Care Of Police Survivors) said the memorial was a way for people who have lost family in the police force "to come together and reflect and remember their loved ones who are no longer with us".
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It comes after officers last week renewed their appeal on the 20th anniversary of Michael Pritchard's death.
The OVO Energy Women's Tour race brought a £1.75 million boost to Northamptonshire's economy this summer.
After a frosty start, the day will brighten up with some sunny spells but remaining cold throughout.