But rather like Holmes’s mind, this is a show capable of whirring in many intriguing directions - as it should do, given that one of the glories of Holmes as hero is his insistence that brains are better than brawn. So anybody tempted to visit because it features the coat and blue scarf worn by Benedict Cumberbatch in the television Sherlock’s “The Reichenbach Fall” may also be enchanted by the Turner landscape of the original setting, or a Monet of Charing Cross Bridge in the kind of London fog Conan Doyle was so fond of describing.