London Grand Prix a 'test' for Farah

British world champions Mo Farah and Dai Greene look ahead to their last competitive race before this summer's Olympics - the London Grand Prix, which takes place this weekend at Crystal Palace.

Farah says he will use the 5,000m event to "test himself" for London 2012, while Greene, who will compete in the 400m hurdles, talks of his pride and the pressures of being named Team GB Olympic athletics captain.

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