Media expert Liz Howell has told ITV Daybreak that so much is expected from new BBC Director-General Tony Hall. "He really has to go in and be a hero," she added.
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The British territory of St Helena is in the South Atlantic, and the government has warned swimmers to enter the sea at their own risk.
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Tony Kim, who taught accounting at Pyongyang University of Science and Technology, was detained as he tried to leave the country.