Huge crowds have gathered in central London as anti-Brexit campaigners demand a second referendum.
According to The Mirror, the People's Vote March set off from Park Lane at midday and will end in a rally in Parliament Square.
Demonstrations are also being held in Manchester with police saying an English Defence League protest and counter campaign is under way.
Around 100,000 activists are expected to march in what has been billed as the biggest public protest against the Brexit situation to date.
Advert
The rally has been backed by a raft of celebrities including Delia Smith and Deborah Meaden from Dragon's Den.
Mayor of London, Sadiq Khan, told Sky News: "I can't think of anything more democratic or British than trusting the British people.
"Some of the promises made two years ago have not materialised. Nobody was talking about a bad deal, or no deal whatsoever.
"the public should have a say on the outcomes, with the option of staying in the EU."
"Jeremy Corbyn and Labour are quite clear, all the options should remain on the table. But the Prime Minister can't get her own cabinet to agree let alone her party.
Advert
"Nobody was saying we won't have access to the single market, nobody was talking about damaging the NHS, and so we should ask the British public, wit the option of staying in the EU.
"As it is now, the NHS is stockpiling medicine, our police are planning for civil unrest, our Prime Minister can't get a deal through cabinet. Let the people have a say."
The march is part of the #WriteThisWrong campaign, in which 100,000 postcards will be distributed with the words: "Brexit has already become a dog's dinner - the whole process is going badly wrong. And it's only going to get worse."
The Mirror spoke to two students leading the march behind a People's Vote banner. Emily Longman, 20, said she was four months too young to vote in the referendum.
Advert
She explained: "We're both Spanish students due to study abroad next year, but no one knows what will happen with Erasmus funding."
Emma Stevens, also 20, added: "We don't want the other European countries to hold the same view [of leaving the EU]."
