BRUSSELS/LONDON (Dec 14): The European Union's (EU) Brexit negotiator, Michel Barnier, said today that sealing a new pact with Britain was still possible as the date for the country's departure from the bloc edged nearer.

But a diplomat in Brussels said the chance remained that the tortuous trade talks could collapse.

Despite missing multiple deadlines, Britain and the EU agreed yesterday to "go the extra mile" to try to break deadlocks on access to UK fishing waters for EU trawlers and corporate fair play rules in order to avert a turbulent split in trading ties at the end of the month.

"We are going to give every chance to this agreement... which is still possible," Barnier told reporters on arriving to update envoys from the 27 EU countries in Brussels on the talks. "A good, balanced agreement."

"Two conditions aren't met yet. Free and fair competition... and an agreement which guarantees reciprocal access to markets and waters. And it's on these points that we haven't found the right balance with the British. So we keep working," he added.

The estranged allies are racing to seal a new partnership deal to carry on trading freely and govern ties from energy to transport beyond Dec 31, when Britain leaves the EU's single market and customs union after Brexit.

Senior EU diplomats, who spoke under condition of anonymity after taking part in Barnier's closed-door briefing, said the negotiator relayed some limited progress on how to settle any future trade disputes but was "guarded" on prospects for a deal.

The sides remained at odds over state aid provisions and have moved further apart again on fisheries, with the EU rejecting UK's proposal for a three-year transition period from 2021 on access to British waters, they said.

"Patient still alive... but keep the undertaker on speed dial," said one of the diplomats of how the talks were going.

Britons voted to leave the world's largest trading bloc in a national referendum in 2016, and pro-Brexit politicians had claimed that reaching a deal would be easy.

While gaps have been narrowing after seven months of tortuous talks, it was not clear if Britain and the EU would be able to clinch an agreement with less than three weeks left, or face economic damage from a no-deal from Jan 1.

That would damage an estimated US$1 trillion worth of annual trade, send shockwaves through markets, snarl borders, and sow chaos in supply chains across Europe just as the continent struggles with economic havoc wrought by the Covid-19 pandemic.

French Finance Minister Bruno Le Maire said today Britain has the most to lose from Brexit.

"The British people will be the biggest losers from Brexit," he said, calling Brexit "a political, economic, and historical folly".

In London, British business secretary Alok Sharma said the EU and the United Kingdom were still apart in Brexit trade talks but Prime Minister Boris Johnson did not want to walk away yet.

"We are of course apart on certain matters but... we don't want to walk away from these talks," Sharma told Sky. "People expect us... businesses expect us in the UK to go the extra mile and that's precisely what we're doing."

Johnson and the president of the EU's executive European Commission yesterday mandated negotiators to continue, although the British premier sounded a downbeat note on prospects for a breakthrough.

"Any deal that we get with the EU has to respect the fact that we are a sovereign country, an independent country and that's the basis on which we will do a deal if there is a deal to be done," Sharma said.