Boris Johnson challenged by Danny Alexander to raise half the cost of XR2 from the private sector. @itvlondon
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The campaign, in partnership with charity Missing People, will see riders attach posters with images and information about missing people.
Conservative mayoral candidate, Shaun Bailey, is promising more than 8,000 additional officers, paid for by a tourist tax on hotel guests.
One third of all rapid responses in the Capital were to treat injuries from stabbings and shootings.