- ...that The Clink prison in Southwark, from which the phrase "in the clink" derives, was possibly the oldest prison in England, founded in the 12th century?
- ...that Bridewell Palace (pictured), originally a residence of Henry VIII, later became a poorhouse and prison?
- ...that another defunct royal palace, the Palace of Placentia in Greenwich, housed a biscuit factory and a prisoner of war camp?
- ...that Newgate Prison was rebuilt in 1782 in an architectural style known as architecture terrible, intended to discourage law-breaking?
- ...that Millbank Prison, used largely to hold convicts who were to be deported to Australia, stood on the site now occupied by Tate Britain?