The man arrested over alleged leaks to the media linked to the "plebgate" affair was not one of the officers at Downing Street during the incident in September 2012, the Metropolitan Police said in a statement.
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Cross-channel services face the possibility of ongoing disruption because of migrant activity in and around Calais.
Big companies will have to show that their supply chains do not use child slave labour or exploit people, David Cameron has announced.
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