Speaking on ITV1's The Agenda, the Mayor of London Boris Johnson has told Tom Bradby the BBC has suffered a "catastrophic breakdown of journalistic standards".
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A total of 8,648 sailors died during the largest naval engagement during the First World War, which marks its centenary on Tuesday.
The figures by the Global Slavery Index are a third higher than previously thought.
Sara Di Pietrantonio, 22, died in Rome on Sunday.