BRUSSELS: The chief negotiators for EU-UK trade talks meet in Brussels on Thursday to try to avoid a breakdown after London said it would backtrack on Brexit divorce terms.

The EU's Michel Barnier and UK counterpart David Frost were set to meet at 1400 GMT at EU headquarters with fears rising of a damaging cliff-edge "no deal" at the end of this year.

An EU spokesman insisted Brussels was still negotiating in good faith, rejecting accusations by Prime Minister Boris Johnson, who has claimed the bloc has threatened to "blockade" food heading for Northern Ireland.

"Michel Barnier has shown ... that even on extremely complex and politically sensitive issues, the commission, indeed the EU, negotiates in perfectly good faith," said Eric Mamer, the EU spokesman.

The negotiators meet as Johnson refuses to back down on controversial new legislation that he openly admits will break international law and which has infuriated Brussels.

The proposed law, which overrides parts of the Brexit treaty relating to trade in Northern Ireland, has threatened to torpedo already deadlocked trade talks.

The British government "probably don't know themselves if they actually want an agreement in the end or a no deal", an EU diplomat told AFP. "Probably a little bit of both."

The diplomat insisted however, that full clarity on whether a deal was possible would not be achieved for "two or three weeks."

The next official round of negotiations, that involve hundreds of negotiators discussing the thorniest topics, will take place in Brussels the week of September 28.