LONDON — Hundreds of thousands of protesters opposed to Britain’s impending exit from the European Union marched through central London on Saturday, demanding a new referendum and to have a say on the government’s final Brexit deal with the EU.

Organizers say another public vote is needed because new facts have come out about the costs and complexity of Britain’s exit from the bloc since voters chose to leave in 2016.

They estimated that some 700,000 people took part Saturday in the “People’s Vote March,” which saw 150 buses of marchers pour into the British capital from all across the country. Police did not provide an attendance estimate.

“What’s clear is that the only options on the table now from the prime minister are a bad Brexit deal, or no deal whatsoever,” London Mayor Sadiq Khan, who joined the march, told the BBC. “That’s a million miles away from what was promised 2 1/2 years ago.”

Khan said Saturday’s protest was a “march for the future” for young Britons, including those who were too young to vote in Britain’s 2016 Brexit referendum, when those who favored leaving the EU won narrowly by 52 percent.

The mayor, from the opposition Labour Party, has previously backed mounting calls for a fresh referendum so the public can have a say on whether they accept Prime Minister Theresa May’s Brexit deal or choose to stay in the EU.

May, the leader of Britain’s Conservatives, has ruled out another public vote on the subject.

That didn’t stop the crowds Saturday from demanding one. Among them was “Lord of the Rings” actor Andy Serkis, who marched with his son and wife. Serkis said he believes there should be a second referendum “now that people are more informed.”

Britain is due to leave the EU on March 29, but talks have been plagued by disagreements


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