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There's not a majority in favour of the draft withdrawal agreement, otherwise May wouldn't have pulled the vote. There's not a majority in favour of withdrawing the Art 50 notice and remaining in the EU, as Labour members would be whipped against voting for it, and they and the ERG nutters would together carry enough votes to vote it down. There's not a majority in favour of leaving with no deal, because only the ERG are stupid/blinkered enough to think that's a good idea. The alternatives involve cake, unicorn poo and magic fairy dust..
How do we know that? We haven’t had any vote of substance on Brexit during this parliament. There is lots of speculation on numbers, but until that is put to the test it is essentially meaningless.