In which case someone should remind him a new referendum becomes official labour policy.

Yvette Cooper (Lab) has already asked the speaker how A50 could be extended. I think we can assume she knows, so the question was for public consumption only.

Bottom line is that if there's a motion to extend A50 it's very likely to pass - maybe not conclusively, but certainly as a means of avoiding No Deal.

We could then be in the interesting position of May clinging on to power, but being forced to cancel Brexit because of a referendum she didn't want.