Are we looking at a photograph of Jack The Ripper? Or is this just a good way of selling a new book?
And if it were Sickert why did the Metropolitan Police fight so hard to keep the file secret after 123 years -Sickert was dead. Other murderers have been revealed over the years. What was the Met worried about -increasing the value of paintings by a world famous killer?
Why? "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." Seriously -after 123 years when there are well written books and TV documentaries on informers and super grasses? Yeah, that sounds....stupid.
And Special Branch holds the files? That's Secret Police if you have no idea who deal with terrorism and "political stuff". Why would Special Branch hold secret criminal investigation files?
Special Branch usually steps in when high government officials, politicians or incidents involving the Royal family crop up. All the excuses given over maintaining the identity of an informer after 120+ years tend to fall apart as soon as you think of them. So was Sickert important enough that there would be a good reason to cover up the fact that he was Jack The Ripper?
He was never a vital part of some British Intelligence scheme or anything else that warranted his protection by Special Branch. https://en.wikipedia.org/wiki/Walter_Sickert