Sports Personality: Sir Ben Ainslie's emotional tribute to Andrew Simpson

Sir Ben Ainslie reflects on the "devastating" loss of his close friend Andrew Simpson who died during training for the America's Cup in May.

Simpson, 36, died when he was trapped under the upturned hulls of his boat after a capsize during training on the waters of San Francisco Bay.

Ainslie pays tribute to his friend, who he says taught him many lessons.