Green Party Assembly Member, Baroness Jones, became embroiled in a row with Boris Johnson at Mayor's Question Time after telling him to "apologise to Londoners" for his record on cycling safety, and his "flawed and dangerous (cycling) policies".
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Hundreds of pupils from Alperton Community School in Brent, London,cheered and waved flags as Andria Zafirakou arrived holding the prize.
Earlier, this week Kensington and Chelsea Council admitted spending almost £21 million keeping survivors in hotels.
Defence Minister Tobias Ellwood sais the UK is going through a "dark chapter" .