Theresa May could pull third Brexit deal vote if it lacks support

Prime Minister Theresa May has told MPs she will not hold a third vote on her Brexit deal next week if she thinks it will not pass. 

This would mean that, just as if it had been rejected again, there will be a new deadline of April 12 for the UK to set out a new plan to the EU. 

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If her deal is accepted, then the UK will be granted an extension until May 22 to allow more time to get everything in order. 

May wrote to all MPs on Friday evening, offering to talk to them over the weekend and start of next week as Parliament prepares to make a momentous decision.

The prime minister outlined four choices for her colleagues, which included approving her deal, asking for another, longer extension that would require the UK to participate in European elections, a revoking of Article 50 which May said would "betray" the previous vote, or to leave the EU without a deal. 

Another issue with passing her deal is that last week speaker John Bercow declared he would not allow May to try and get the same or "substantially the same" deal through Parliament for a third time.

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It comes as supporters of the people's vote, who are calling for a second EU referendum, will march through central London today. 

Labour deputy leader Tom Watson will speak at the march and pledge to back May's deal if she can guarantee to hold a referendum on it.