COUNTDOWN TO THE VOTE: SO WHAT COULD HAPPEN...

1 may cancels the vote and goes to brussels

embarrassing but less damaging than a commons monstering if mrs may postpones the vote and begs the eu to reopen talks, with a future vote on any new deal.

2 may has vote on tuesday and loses by less than 75

survivable if may immediately declares she is going to brussels to demand further concessions.

3 may has vote and loses heavily

observers expect this would trigger immediate demands for mrs may to resign.

4 commons amends vote to seize control of brexit

major headache for mrs may if tory rebels and labour chiefs demand a second referendum or a softer brexit.

5 vote of no confidence

Which means she must quit if she loses. or she could face an internal leadership challenge from within the tories.

6 she Wins brexit vote

it could happen. but it might take two or three attempts.