Four thick ledgers compiled by Special Branch officers have been kept under lock and key since the Whitechapel murders in 1888.
Trevor Marriott, a Ripper investigator and former murder squad detective, has spent three years attempting to obtain uncensored versions of the documents.
But he has been repeatedly refused because the ledgers contain the identities of police informants – and the Metropolitan Police insist that revealing the information could compromise their attempts to gather information from “supergrasses” and other modern-day informants.
Last week, Mr Marriott took Scotland Yard to a tribunal in a last-ditch attempt to see the journals – containing 36,000 entries – which he believes contain evidence which could finally unmask the world’s most famous serial killer.
The legal case has cost the taxpayer thousands of pounds and has even involved a senior Scotland Yard officer giving evidence anonymously from behind a screen.