Jeremy Corbyn has left the door open to allowing another caretaker prime minister to replace Boris Johnson if he is defeated in a vote of confidence.

He will also not explicitly reject the option of a so-called government of national unity that has a purpose beyond ensuring Britain does not leave the EU without a deal on October 31.

The Labour leader will meet other opposition leaders to discuss tactics on Monday after Nicola Sturgeon, the first minister of Scotland, called for a confidence vote, testing the fragile coalition working to stop a no-deal Brexit.

Opposition parties at Westminster have so far held to the line that they will resist an election at least until Mr Johnson has agreed to a Brexit extension. The prime