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.
More top news
The NHS is to set up 11 centres to unlock the secrets of DNA and help develop tests and drugs to target cancer and rare genetic diseases.
Australian businessman named as Alan Sugar's newest apprentice and winner of a £250,000 investment in his fledgling company.
The 270 victims of the Lockerbie bombing have been remembered today, 26 years to the day that they lost their lives in the air disaster.