It was quite a moment when a minister of the crown called the King's brother "rude, arrogant and entitled" at the despatch box of the House of Commons. Granted, Sir Chris Bryant was almost as disobliging about Andrew Mountbatten-Windsor 15 years ago, as an opposition MP, when there were calls then for him to be sacked as the government's trade envoy. So Sir Chris's views about the former prince are not new but still, when speaking on behalf of the government, it tells you something about how the collapse in respect for Mountbatten-Windsor has been near total. But the debate in the Commons, triggered by a Liberal Democrat demand for documents relating to the former prince's appointment as a trade envoy to be published, was not a case study in and of itself in a collapse of parliamentary deference around the Royal Family. Andrew Mountbatten-Windsor has effectively been fired out of a cannon — disowned by the Royal Family and the political classes, and stripped of his titles.…