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The Somali-born runner, Mo Farah, has become one of the heroes of the London 2012 Olympics after winning Gold in the 5,000 and 10,000 metres for his adopted country.

As Farah leads a parade of British athletes through London, Witness speaks to Alan Watkinson, the school sports teacher who transformed Farah's life.

(Image: Mo Farah. Credit: Associated Press)