Lawyers for the European Union on Tuesday told an arbitration tribunal that Britain's ban of fishing for sandeels in its North Sea waters breached an agreement on fishing rights both sides struck after Brexit.

More than half of Brits (55%) believe the country was wrong to vote to leave the EU in 2016, while 30% say it was the right decision, according to a new YouGov poll. This means public support for Brexit has now fallen to its lowest level since YouGov began asking this question after the referendum.

The row was triggered when Britain barred EU fishermen from catching sand eels in English and Scottish waters last March

The EU and UK face their first post-Brexit legal showdown as the bloc challenges Britain's North Sea sandeel fishing ban – a minor environmental case with major political implications.

The tiny sand eel is used widely as bait and in animal feed — but it's also an important food source for puffins and other seabirds.