Why is it that those who most vehemently proclaim their own virtue are inevitably those who have some nasty skeletons rattling around in the closet? Take our virtue-signalling PM and his recently unearthed penchant for dressing in blackface, the ne plus ultra of progressive sins. Covering one’s face in black paint isn’t illegal, of course, but it is an affront to contemporary mores. To unpack the distinction between law and morality, John Robson looks at Lord Devlin’s 1965 book, The Enforcement of Morals. Robson makes clear that breaking the law may be one thing, but offending the moral code of the age can extract an even greater price.