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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Police were called to a fight between two groups of people on the petrol station forecourt at Cobham services.
The barriers are part of a series of measures put in place by the Metropolitan Police.
Resident group Justice 4 Grenfell say they were not consulted and will raise concerns about the appointment at the highest level.