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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Generally cloudy with fairly persistent rain through this evening.
A cloudy evening, with sporadic outbreaks of rain or drizzle. These will ease away overnight, with a few clear spells around dawn.
The House of Commons Petitions Committee has said they will keep an eye on the petition and are concerned about fraudulent signatures.