Boris Johnson’s Eton housemaster warned that he thought himself “free of the network of obligation which binds everyone else”. Decades passed, and Mr Johnson remained cavalier about following the rules. Propriety, even as prime minister, was disgracefully little more than performance. His post-office conduct suggests he still treats norms as optional.

Leaked documents from Mr Johnson’s private office, obtained by the transparency group Distributed Denial of Secrets and seen by the Guardian, raise grave questions about his adherence to standards – and whether public money has helped fund his post-premiership business empire. They centre on the public duty costs allowance (PDCA), an........

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