By Martin HickmanRebekah Brooks's secretary, Cheryl Carter, was arrested by detectives days before she was about to board a plane to emigrate to Australia, the phone hacking trial heard today.Police suspected that the move to Australia was a reward for removing Mrs Brooks's notebooks covering the period when hacking was rife at the News of the World, the jury was told.The removal of the archived notebooks at the height of the hacking scandal two years ago forms a charge of conspiracy to pervert the course of justice charge against Mrs Brooks and Mrs Carter, her long-serving personal assistant.Seven boxes of material logged "All notebooks from Rebekah Brooks (nee Wade) 1995-2007" were delivered urgently from NI's archive in Enfield to its Wapping HQ a few miles away on Friday 8 July 2011, a day before the News of the World rolled off the presses for the last time.Mrs Carter later told the archivist Nick Mays that the notebooks belonged to her and Deborah Keegan, another of Mrs Brooks's assistants, rather than to Mrs Brooks herself.Giving evidence, Mrs Carter's son Nick Carter, 23, said he, his mother and Mrs Keegan's husband Gary had collected the boxes from the basement of Thomas More Square, Wapping, and loaded them into his car. He had then driven them to the Carter family home and plonked them inside, probably on the landing.Mr Carter, an administrative assistant at News International, said that he had no idea what was in the boxes and did not ask his mother.Trevor Burke QC, representing Mrs Carter, reminded him that when the police had interview him in late 2011 they had suggested that his family's imminent emigration to Australia was a reward for his mother's help in removing the boxes.Mr Burke then went through the family's long preparations for the move, which, he suggested, had dated back to at least February 2007 when the family was granted a five-year visa for entry to Australia.Mrs Carter had not enjoyed life on the corporate floor of News International upon Mrs Brooks's promotion to chief executive in 2009, he told the Old Bailey, and she had begun to hanker for a move back to the Sun.Mr Burke went on: "With the closure in July 2011 of the News of the World and your mother losing her job the family proposed to emigrate."Mr Burke asked Mr Carter: "Were you aware that your mother had a job interview on Mr Murdoch's newspaper, The Perth Times, where she was looking for a job as a secretary?" Mr Carter said he had not.Mrs Carter was arrested on 6 January 2012, three weeks before the family were due to board flights to Perth on 26 January 2012. That was shortly before their five-year visa was to expire, Mr Burke told the court.