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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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.