The film is set in 1884, but eagle-eyed fans noticed that the Enola Holmes poster inexplicably includes an image of London’s Portcullis House, a government building that was finished in… 2001.

But Portcullis House is, in fact, an extremely expensive office block for MPs which has cost so much money it is going to be the subject of an inquiry by the National Audit Office (NAO). With a bill ...