British newspaper The Times reported yesterday that senior EU officials and other European leaders told British Prime Minister Theresa May that "conditions for an extension to the Article 50 exit process would include the option of a second vote on EU membership".
He said without that the prime minister "will not find our support for a deal".
A pro European Union demonstrator releases flares as the march kicks off
Although there are signs of both groups wavering in their hostility to Mrs May's plans, she still faces an uphill struggle to overturn the 149-vote defeat she suffered three days ago.
The Commons will vote on her withdrawal agreement by 20 March, after previously rejecting it by 230 and then 149 votes.
Some of her most implacable internal opponents are also pressing for her to promise to resign by the summer in return for their help in getting her over the line.More news: Nigel Farage to lead 400km Brexit protest march
The Prime Minister apparently breaking her word by attempting to Article 50 - she will require the EU's agreement to do so - will leave many wondering whether they can trust her other promises; for example her vow to stand aside as party leader before the next general election, made in exchange for Tory MPs not backing her ouster in a recent vote of no confidence.
"That's the best option", the French presidency said, in which case no European Union state is expected to oppose a "technical extension" that would give Britain time to vote on a series of laws for ensuring a smooth Brexit.
"We are here in the very week when parliament is doing its utmost to betray the Brexit result", Farage said.More news: Christchurch attacker meant to continue rampage when arrested, says PM
In the pouring rain in Sunderland, northeast England, which was the first place in Britain to declare a vote to leave the EU, Farage, wearing a flat cap and carrying an umbrella, said Brexit was now in danger of being scuttled by the establishment.
The Chief Whip Julian Smith abstained, with sources suggesting he did so to be able to "broker peace going forward".
"Without any clarity, no solution is possible", President Emmanuel Macron's office said, adding that if the current withdrawal deal is rejected, a "clear and new alternative plan" must be presented or else Britain will have to leave the European Union with no deal. It must be a swift one, with objective. But Mrs May's party is still severely split, with more than half voting against the delay.More news: England axe Cokanasiga for Scotland clash
The delay was welcomed by business, with Josh Hardie of the CBI saying it showed "there is still some common sense in Westminster".