Credit: Crown Copyright/Open Government Licence v3.0 The UK’s data-protection watchdog has hit the Home Office with a formal reprimand after paper documents containing personal information and details of anti-terrorism activities were left at a venue in London. The warning is the second time in little more than a week that the department has been publicly censured by the Information Commissioner's Office. The latest reprimand relates to an envelope containing four files that, on 5 September last year, was left at an unnamed public location somewhere in the capital. The documents – which comprised two reports from the Home Office’s Extremism Analysis Unit, and two copies of a report on counter-terrorism policing – were found by staff at the venue and handed over the police. They were then returned to the Home Office the day after they had been mislaid. The files were classified as ‘Official Sensitive’ and contained information deemed as ‘special category’ under data