However welcome such a cut in red tape might be to London, the UK is also insisting on a further, fundamental change. It wants the EU to cede final legal oversight by its top court of any trade disputes and instead make them subject to independent arbitration. No such concession was forthcoming from Sefcovic on Wednesday.

“It’s very clear that we cannot have access to the single market without the supervision of the European Court of Justice,” Sefcovic told reporters, rejecting any chance that the EU would yield to the British government on the issue.

EU officials, many of the remaining 27 member nations and the bloc’s parliament have bristled at the thought that the EU’s Court of Justice would lose its pre-eminence over part of its trading market that spans a area of some 450 million people, and Sefcovic’s room for manoeuvre is narrow in negotiations starting later this week.

UK counterpart David Frost was hoping for a drastic overhaul of the Northern Ireland deal. He warned Wednesday that the role of the EU’s top court “has to change if we’re to find governance arrangements that people can live with”.

Jeffrey Donaldson, leader of the Democratic Unionist Party, Northern Ireland’s largest British unionist party, said the EU proposals appeared to “fall far short of the fundamental change needed”. “Short-term fixes will not solve the problems that have beset the United Kingdom internal market,” Donaldson said.

Britain hopes to join CPTPP in 2022, has no date yet for US trade pact

Both Britain and the EU agreed it was essential to avoid a hard land border between Northern Ireland and EU member Ireland, the only part of the bloc to have a land border with the UK after Brexit. Northern Ireland was the scene of deadly sectarian violence before the border posts were brought down as a key part of the 1998 Good Friday agreement.

The EU thought years of Brexit wrangling were over when the government of British Prime Minister Boris Johnson officially signed the legally binding divorce agreement and the subsequent free trade deal at the end of last year. The deal called for establishing a border in the Irish Sea to regulate trade between Northern Ireland and the UK.

Now, the EU says Johnson is seeking to row back on the Northern Ireland deal that he himself signed.

Charges of British duplicitousness were given even more fodder Wednesday when Johnson’s former top aide, Dominic Cummings, suggested Johnson’s government never intended to honour the Brexit agreement it signed.

“That would indicate that this is a government, an administration, that acted in bad faith and that message needs to be heard around the world,” Irish Deputy Prime Minister Leo Varadkar told Irish broadcaster RTE.

“This is a British government that doesn’t necessarily keep its word and doesn’t necessarily honour the agreements it makes,” he added.

France has similarly said that Britain cannot be trusted in a dispute over fishing licences that Paris said should have long been granted as part of the signed trade deal with London.

Britain irks EU with call to ‘rewrite’ post-Brexit trade rules

It is in such a heated context that Sefcovic now must negotiate with Frost to smooth trade in Northern Ireland. Their first meeting is scheduled for Friday in Brussels. Both refrained from making any belligerent comments on Wednesday.

They will assess the wide-ranging proposals to cut the paperwork for goods entering Northern Ireland, and eliminate impediments that have created irritants – such as when British Cumberland sausages could not make it onto Belfast dinner tables because of EU rules on chilled meat.

But the EU insists that any concession on cutting red tape must also be met by a UK commitment to vigilance in monitoring and performing customs checks on goods sent from Britain across the Irish Sea into Northern Ireland.