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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Cloudy with further outbreaks of rain, which are likely to become heavy at first. Staying generally dry after midnight.
Outbreaks of rain will slowly clear all but the far south by morning, where it could turn briefly heavy for a time.
Police in Nottingham are growing increasingly concerned for an 18-year-old girl who has been missing for four days.