There is an infallible way to identify politicians and commentators who have not read article 50 of the Lisbon treaty. What gives their game away is the complacent and mistaken assertion that a no-deal Brexit is impossible on the grounds there is no majority for it in the House of Commons. The reality is that a campaign to undo the 2016 referendum is virtually impossible without the explicit support of the government. When British cabinet ministers resigned hours after the publication of the withdrawal agreement between the UK and EU, they could not conceivably have read it, let alone digested its finer points. Many of the MPs who denounced the much shorter political declaration did not read that either. If they had done so, they might have discovered that this is not such a bad deal at all. There can be no deal with the EU based on the opposition Labour party’s six tests. You cannot be in a customs union with full immigration control. Nor could there be a deal without an Irish back...

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