1820s Britain: after the wars with France, when unemployment was high and soldiers could be paid off, when the government was desperately afraid of social unrest, any crime was drastically punished and thousands were hung. But one could petition the King and an investigation might ensue…The man in the dark cell in Newgate Prison was due to hang in a week. He had been found guilty of murdering the aristocrat whose portrait he was painting. He claimed to be innocent – but then the hangman had...