Shakes-Drayton storms to PB

Great Britain's Perri Shakes-Drayton wins the women's 400m hurdles at the London Grand Prix in a personal best of 53.78 seconds.

Shakes-Drayton is now the second fastest British woman ever in the event, behind Sally Gunnell.

The Briton easily saw off competition from European champion Irina Davydova and Olympic champion Melaine Walker.

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