Mayor of London Boris Johnson posed with a personalised West Ham football strip at the photocall for the Olympic stadium announcement.
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The Home Office has launched an advertising campaign which aims to deter people from carrying weapons.
Hundreds of pupils from Alperton Community School in Brent, London,cheered and waved flags as Andria Zafirakou arrived holding the prize.
Earlier, this week Kensington and Chelsea Council admitted spending almost £21 million keeping survivors in hotels.