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and I grant that the motivation may be to make no deal less likely
Then we agree.
but where is an actual route forward that isn't no deal?
This is all happening very fast and parliament has been able to show that there is not support for no deal. It would be dumb to predict the coming days/weeks. However! I do think the EU would be open to extending article 50. And we do know the UK can unilaterally withdraw.
But the EU has said, repeatedly, that they won't re-negotiate the WA.
The single market access and customs union can be negotiated in the next part of the sequence - but not if there is no WA. Corbyn's ambitions there are impossible on both counts, anyway, which makes it doubly unlikely that the EU would agree to a) re-open negotiations and b) turn the sequence on it's head.
Labour are voting for measures which make a hard Brexit less easy to mitigate, and I grant that the motivation may be to make no deal less likely - but where is an actual route forward that isn't no deal?