Undercover reporter Emer gets a job in Serco’s tagging operation. She discovers a flawed system relying on manual labour to input important information about offenders who need to be tagged. Watch: 'Undercover: The Great Tagging Scandal' streaming now on the Channel 4 website. #AnkleTag #Probation #Serco #Prison #UKPrisons #Documentary #C4Dispatches #Channel4