Jodie Marsh said: "The Diana Award National Anti-Bullying Ambassadors Conference is a great event that brings hundreds of young people together to stop bullying. I wish there was an anti-bullying programme that was available to me when I was younger."
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.