The EU member states agreed on Monday to postpone Britain's divorce from the bloc for up to three months until January 31, with possible ramps beforehand.
"The EU27 has agreed that it will accept the UK's request for a Brexit push-up until January 31, 2020," tweeted the president of the European Council, Donald Tusk.
EU member states will wait for Britain's response to its offer of a 3-month delay to Brexit before launching a "written procedure" whereby governments will have 24 hours to accept or reject the agreement reached by their envoys to Brussels on Monday.
"We can only start the written procedure when we have the UK government agreement on the text," said a senior EU official.
Two senior EU diplomats confirmed that the agreed written procedure period was 24 hours, effective from the moment London accepts the offer of an extension to leave the European Union from October 31 to January 31.
"This will allow the decision to be formally taken tomorrow," said a third diplomat.