David Miranda, the partner of the Guardian journalist who broke stories of mass surveillance by the US National Security Agency, has accused Britain of a "total abuse of power" for interrogating him for almost nine hours at Heathrow under the Terrorism Act. In his first interview since returning to his home in Rio de Janeiro early on Monday, Miranda said the authorities in the UK had pandered to the US in trying to intimidate him and force him to reveal the passwords to his computer and mobile phone. "They were threatening me all the time and saying I would be...