PM speech comes after letter from Tusk and Juncker says EU will consider technological alternatives to backstop

• Theresa May refuses to rule out Brexit article 50 extension
• EU rejects Irish backstop time limit but backs technological solution
  
• May’s Brexit speech and Q&A - Summary
• Brexit - Summary of overnight and early morning developments

4.11pm GMT

In an article for the Guardian, Emily Thornberry, the shadow foreign secretary, says that historical precedent dictates that, if Theresa May loses the Brexit vote tomorrow, she should call a general election.

Here is an extract.

In this week in 1910, the British electorate went to the polls. They did so because Herbert Asquith’s Liberal government had been unable to get Lloyd George’s famous People’s Budget through the House of Lords. Liberal posters defined the election as a choice between the peers and the people. They finally got their way after a second election that December.

So twice that year, and a number of other times, governments who could not get their flagship legislation through parliament, or who otherwise found their authority in the House of Commons exhausted, have been obliged to go to the country to seek a new mandate.

Related: If Labour supports a public vote we’ll take no lectures from Tories about democracy | Emily Thornberry

4.05pm GMT

Conservative MPs have been told that Theresa May will address the party’s backbench 1922 committee at 7pm, after her statement to the Commons. And Jeremy Corbyn will be addressing the parliamentary Labour party meeting tonight too.