The Met Police is fighting a legal battle to keep files detailing the investigation into the notorious Jack the Ripper case secret - to maintain confidentiality for Victorian 'supergrasses'. The documents are said to include four new suspects for the serial killings which terrorised Whitechapel in 1888 and have become one of the world's most infamous unsolved cases. The historic ledgers have 36,000 entries detailing police interaction with informants between 1888 to 1912. However, Scotland Yard reportedly believes disclosing the names could hinder recruiting and gathering information from modern informants, affecting terrorism investigations - and even lead to the Victorians'...