The campaign, "March for the Future", from Park Lane to Parliament Square was dubbed by the organisers, Open Britain, as the "biggest, loudest and most important" demonstration on Britain's future.
The People's Vote campaign, which includes several pro-EU groups, said they had stewards stationed at regular intervals to estimate the size of the crowd.
Matthew Cooke, 28, who had come down from Scunthorpe with the Modern Union for a Changing World, explained the reporters that "Brexit in its guise is no good for jobs, no good for workers rights and no good for people's finance".
Regardless of your stance on brexit I think we can all agree that no one voted for this absolute clusterfuck of political point scoring, lies disguised as sound bites and global humiliation brought on by cowards and power hungry bananas arseholes.
May is, however, hopeful of negotiating a deal with the EU.
Britain is scheduled to leave the European Union in March, and the Bank of England has warned that economic chaos will follow if the sides fail to reach a deal.
Major League Baseball has fined Manny Machado for running into Jesús Aguilar
The Dodgers acquired Machado from Baltimore this season for their playoff push and to replace injured shortstop Corey Seager . Machado shrugged off the criticism in the aftermath, and on Wednesday manager Dave Roberts took the same approach.
Polls show support for a second referendum evenly split - the same as with Brexit itself.
"There'll be no second referendum".
Addressing the rally, he said it was the "majority" of his generation that voted to leave, "taking the freedom" away from young voters.
The march, dubbed the People's Vote March, attracted TV chef Delia Smith, presenter Richard Bacon and former Dragon's Den star Deborah Meaden.
Mayor of London Sadiq Khan, front center, holds a klaxon horn, as he joins protesters in the People's Vote March for the Future, in London, Saturday Oct. 20, 2018. The terms would probably have to be ratified by the British Parliament but the organizers of Saturday's march feel the people should be given the final say.
Corbyn's absence was despite delegates at Labour's recent conference supporting a motion to keep the People's Vote option on the table, while acknowledging their preference would be for a general election.
The Prime Minister has been accused of ignoring the will of the British people by refusing to bow to demand for another referendum on the final Brexit deal.
They said: "The prime minister has been clear". Peter said: "I remember the Troubles from the 70s".
"We all want what's best for this country and we are the true patriots", he said. "The great majority of the public now agree, polls show, that they should take that decision on whether or not we go over this cliff-edge, or whether we stop it and stay in the European Union".