There cannot be a single reader of Professor John Tulloch's story who doesn't cringe at the injustice if the threatened deportation of a man as British as the white cliffs of Dover; a son of the Empire with three generations of Indian Army before him, a family with roots in England since the 14th century. His error was to take 'dual' Australian citizenship whilst working there - a mistake that has allowed the Home Office to apply the petty and exact rules of citizenship to invalidate his right to live in his home country.
This case doesn't need a change in the law. It doesn't need a lengthy case in the ECHR. To correct bureaucratic stupidity, ministers have available the remedy of exercising the Royal prerogative - it's what they hold the seals of office for. Over to you, Theresa May. It's what you're for.