Horatio Chapple death: Mother 'worried about polar bears'

The family of an Eton schoolboy who was killed by a polar bear say they hope "the truth will be established" at an inquest into his death.

Horatio Chapple, 17, from Salisbury, died on an expedition to Svalbard in Norway organised by the British Schools Expedition Society (BSES) in 2011.

Jon Kay reports.