"It's as black as Newgate's knocker" is an old phrase that will be familiar to many Londoners. But just how black was the knocker? Well, now you can see for yourself; I believe this is the only image on the net of the door knocker from the infamous Newgate Prison. "As black as Newgate's knocker" - The door knocker from the last Newgate Prison This phrase was known by 1880 and remained popular well into the 20th century. Latterly it seems to have been most commonly used by pa