Stabbed boy had speech for Cameron

David, a 14-year-old pupil from Walworth Academy and the youngest knife crime victim this year, won a school competition with his speech - a plea to teenagers to stop carrying weapons - and was due to take part in a borough-wide round.

Esther Akinsanya, at the Idowu home, told the Evening Standard: "He wanted to give the speech to David Cameron. He thought a lot about it and believed in what he had written."