EU leaders have agreed in principle to extend Brexit until 31 January 2020 – meaning the UK will not leave as planned on Thursday.

EU Council President Donald Tusk said it was a “flextension” – meaning the UK could leave before the deadline if a deal was approved by Parliament.

It comes as MPs prepare to vote on proposals by Boris Johnson for an early general election on 12 December.

The SNP and Lib Dems have also proposed an election on 9 December.

The government has not ruled out getting behind that proposed date, if it fails to get its preferred date through the Commons later.

The UK was due to leave the EU on Thursday, but Mr Johnson was required to request an extension after Parliament failed to agree a Brexit deal.

The prime minister had repeatedly said the UK would leave on 31 October deadline with or without a deal, but the law – known as the Benn Act – requires him to accept the EU’s extension offer.

The president of the European Parliament, David Sassoli, said the extension was “positive”, and “gives time for the UK to make clear what it wants”.

Downing Street said Mr Johnson had not yet seen the EU’s response to his request for a Brexit delay.

“The PM will respond once he has seen the detail,” his official spokesman said. “His view has not changed. Parliament should not have put the UK in this position and we should be leaving on 31 October.

“The PM secured a great new deal despite being told this impossible but Parliament has chosen more dither and delay.”

Boris Johnson’s “do or die” pledge to leave by 31 October is no more – it is dead.

Many will see this as a no-deal Brexit being taken off the table, at least until 31 January.

So it will increase the arguments in the Commons that with no-deal parked, Parliament now has to make a decision on an election.

And that is what Mr Johnson will be trying to argue over the next few days.

For the PM, there is a risk of calling an election without Brexit being resolved, as he may be punished for it at the ballot box.

So, while it buys more time, it also creates an element of uncertainty for the prime minister.

He will now campaign for an election in the knowledge that he has failed in his signature policy which he campaigned for in the Conservative leadership election.

Mr Tusk will now seek the UK’s formal agreement to the decision, before formalising the extension through a written procedure among the 27 other EU nations.

An EU official said they hoped for the process to be concluded by Tuesday or Wednesday.