Nigel Pocklington, Chief marketing officer at Hotels.com, speaks about the rise in hotel prices seen in London after the Olympics.
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The organisation wants to preserve as many signs as possible to add to their collection of protest art.
Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.