What is the point of asking a question to which you already know the answer, NJ? Just because you view the two deals negotiated with the EU as unsatisfactory doesn't mean that they do not represent a material change. For example, such deals represent the current best the UK can achieve in its negotiations with the EU, and they are a far cry from what was suggested would be possible: all of that stuff about "easiest deal in history", etc etc. "No Deal", meanwhile, while always a logical possibility, was only ever mentioned by the Remain campaign, and then as a threat to be dismissed. Now it is being trumpeted as the only true form of Brexit. That, too, represents a material change, regardless of your assessment of No Deal.
//Strange that it would require one referendum to Remain but two or more to Leave. Some democracy.!//
I've already rebutted this point. Firstly, it's manifestly nonsense that the Leave campaign would have faded quietly into obscurity. Of the lessons of either recent referendum have shown us anything, it's that referendums merely re-energise the debate. There is no doubt in my mind, for example, that Farage would have tried to use a narrow defeat as a springboard to make further attempts to gain a foothold in Parliament. And, who knows, he might even have been successful. Counterfactual history is difficult, of course, but it is more or less certain that the Europe Question would have remained a part of UK politics for a long time, and probably a large enough part that calls to revisit the issue would never have quite died down. Leave supporters here often claim that they would have accepted the result, and I don't doubt their conviction on that, but I also don't believe for a second that people who have described EU membership as "vassalage", etc, would have been so happy to accept it for generations to come if it were truly as black as they have painted it.
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As to TTT's earlier question, "surely the result of the 2016 vote must be implemented as promised in the leaflet sent to every household." I agree that it was and still is incumbent on Parliament to try in earnest; but, equally, I don't believe that Parliament should vote through anything that had the word "Brexit" on the cover, regardless of the contents. It would just be a different version of that charge against die-hard Labour voters, ie that they'd vote through an actual goat if it wore a red rosette. Does the end goal of Brexit really justify the means? If we can only achieve Brexit by either introducing a border within our own country, or by making a decision that is certain to have damaging and lasting economic consequences, why is it so unreasonable to think again?