But if good progress is made this week, talks could be extended, according to UK Environment Secretary George Eustice.

With just over four weeks left until the UK quits the EU on December 31st, both sides are demanding concessions on fishing state aid on resolving future disputes.

Almost a trillion dollars worth of trade is at stake.

Fishing rights, in particular the accounting for less than 0.1% of the UK economy have become a totemic issue.

Britain is demanding full control of its waters, something Brexit supporters see as a symbol of regained sovereignty.

Since formally leaving the bloc a the end of January, Britain has been in a transition period with rules on trade, travel and business unchanged.

Talks between you chief negotiator Michelle Barnier on Britain's David Frost continued through Sunday.