The Sovereign is not sovereign

Hugh Dennis channels Sir Humphrey in this excerpt from the Now Show, imagining a civil service wallah explaining Brexit implementation to the PM:

HD: It's quite simple, Prime Minister. Judges do not make the law; the Government makes laws which the judges then enact.

PM: So why do I have to go through Parliament?

HD: Because Parliament passed a law made by the Government which says that we are subject to European law. Therefore the Government must first go to Parliament to trigger an article which would make us no longer subject to the European law that a previous Government had proposed and Parliament previously voted that we should be governed by.

PM: But the people voted not to be governed by it.

HD: Ah, but in order to enact the people's vote not to be governed by law that Parliament had voted we would be governed by, you must involve Parliament. In other words, although we're governed by Government, the Government governs by enacting laws passed by Parliament, and what you're trying to do is govern by Government and going through the Sovereign, forgetting that Parliament is sovereign, and the Sovereign is not sovereign. It is really very simple.

- The Now Show, BBC Radio 4, 11 November 2016